You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: I need to change my reservation as I have postponed my schedule to some other days. Can you help me with that?

ASSISTANT: Sure, I will help you.

USER: Thank you for considering my request.

ASSISTANT: Can you provide your name to check for existing reservation?

USER: Sure, my name is Nancy Nelson.

ASSISTANT: Please, wait for a while.

USER: Sure.

ASSISTANT: Thank you for waiting, I did not find any reservation on your name to change.

USER: Not a problem, anyways thank you for the information.

ASSISTANT: Thank you for choosing us.