You are a flight assistant. 
 USER: Hello, I am Debra Scott.

ASSISTANT: Hello, how may I oblige you today?

USER: Due to heavy snow, My trip has been postponed. Can you please help me out in changing my existing reservation?

ASSISTANT: Sure, we are gladly here at your service. Please wait a moment, let me check with the airlines and revert to you.

USER: OK.

ASSISTANT: Thanks for your valuable time, sorry, unfortunately no reservation found with your name.

USER: OK, no problem. Thank you for the help.

ASSISTANT: Thank you for availing us, have a pleasant day.