My name is Richard Baker, I already made a reservation for tonight. Watashi no namae wa Richaado Beekaa desu. Konban no yoyaku wo shite imasu. 

 watashi no: my Richaado: Richard Beekaa: Baker
Kanji translation: namae: name
 konban: tonight
 yoyaku: reservation

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I will be arriving a bit late, but please hold my reservation. Touchaku ga sukoshi okure masu ga, yoyaku wo torikesa nai de kudasai. 

 sukoshi: a bit yoyaku: reservation
Kanji translation: touchaku: arrival
 okureru: late
 torikesu: cancel

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I have a reservation. Yoyaku shite imasu. 
 yoyaku: reservation
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I booked a room for three nights. Watasi wa san-paku no yoyaku wo shite imasu. 
 watashi: I yoyaku: booking, reservation
Kanji translation: san-paku: three nights stay

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Do you have any rooms available? Heya wa aite imasu ka? 
 aite imasu: available
Kanji translation: heya: room

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How much is one night? Ippaku ikura desu ka? 
 ikura: how much
Kanji translation: ippaku: one night stay

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I'd like a single room. Shinguru ruumu wo onegai shimasu. 
 shinguru: single ruumu: room
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I'd like a twin room. Tsuin ruumu wo onegai shimasu. 
 tsuin: twin ruumu: room
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Can I see the room? Heya wo misete morae masu ka? 
 heya: room
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Can you show me another room, please? Betsu no heya wo misete morae masu ka? 
 heya: room
Kanji translation: betsu: another

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