You are a flight assistant. 
 USER: Hi, I am Stephen Robinson.

ASSISTANT: Hello. How may I oblige you today?

USER: My meeting got postponed as of now, so I need to change my existing reservation.

ASSISTANT: Sure, please wait for a while I will check the reservation status.

USER: Ok.

ASSISTANT: Thanks for waiting, unfortunately there is no reservation found by this name.

USER: Ok, no issues.

ASSISTANT: Thanks for availing us.

USER: Thank you.