You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I be your helping hand?

USER: I am William Smith. I want to change my reservation as my meeting was got postponed? Can you please help me to change my reservation?

ASSISTANT: Sure, please wait a minute.

USER: Ok.

ASSISTANT: Thanks for waiting, there is no reservation on your name.

USER: Ok, no problem. Thank you so much.

ASSISTANT: Thank you for reaching us.