You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. What can I do for you?

USER: My meeting has been postponed.Can you please help me for changing the existing reservation?

ASSISTANT: Sure. May I know your name?

USER: My name is Gary Davis.

ASSISTANT: Sorry, no reservation has been found on your name.

USER: Ok, no problem.

ASSISTANT: Thank you for choosing us.

USER: Thank you for your information.