You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: Due to heavy rain fall my trip has been postponed.Can you please help me for changing the existing reservation?

ASSISTANT: Sure, I will help you in this intent.

USER: Thank you.

ASSISTANT: May I know your name please for further process of changing your reservation?

USER: My name is George White.

ASSISTANT: George, please wait for a mean while.

USER: Sure.

ASSISTANT: Sorry George, there is no reservation found on your name to change your reservation as per your details.

USER: Ok, no problem.

ASSISTANT: Are you expecting any other help from my side?

USER: No, thank you for your information.

ASSISTANT: You are welcome always.