You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: I made a reservation earlier to attend a business meeting at Philadelphia but due to some issues it has been postponed. Can you help me in changing my reservation?

ASSISTANT: Can I know your name to check your reservation?

USER: I am Brian Davis.

ASSISTANT: Ok, please wait.

USER: Sure.

ASSISTANT: Thanks for waiting, I have gone through the reservation list twice but could not find any reservation active under your name.

USER: Ok, no issues. Thank you for your information.

ASSISTANT: Welcome, have a good day.