You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, How can I aid you?

USER: I am Sharon Thompson. I want to change an existing reservation, due to my interview got postponed. Will you help me in changing the reservation?

ASSISTANT: Sure. Wait for a while.

USER: Sure.

ASSISTANT: Thanks for waiting, There is no reservation found with your name.

USER: Not an issue. Thanks for your service.

ASSISTANT: Thank you.