You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

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 name?

USER: I am Timothy Lopez.

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

USER: That's ok. Anyways, thank you for your help.

ASSISTANT: Thank you.