You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you today?

USER: I had planned to go on a trip, but it was postponed. Can you change my recent reservation?

ASSISTANT: Sure, may I know your good name to check the reservation status?

USER: John Moore.

ASSISTANT: Please wait.

USER: Ok, take your time.

ASSISTANT: Sorry, there is no reservation found on your name.

USER: That's ok. Anyways, thank you.

ASSISTANT: Thank you for choosing us.