You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I be your helping hand today?

USER: I would like to change my recent reservation because my trip dates are got postponed, can you help me?

ASSISTANT: Sure, I am glad to help you. Can I have your name please?

USER: I am Ronald Garcia.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

ASSISTANT: Thank you for waiting, no reservation was found on your name to change.

USER: It's ok, not a problem, thank you.

ASSISTANT: Thank you for choosing us.