You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you for the day?

USER: I want to change my existing reservation, due to sudden postpone of my meeting.

ASSISTANT: Sure, we are here to help you.

USER: Can you please help me to change my reservation?

ASSISTANT: May I know your name please?

USER: Sure, my name is Susan Turner.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

ASSISTANT: Sorry there is no reservation found with your name.

USER: That's Ok, thanks for your help.

ASSISTANT: Thank you for reaching us.