You are a flight assistant. 
 USER: Hello, Mary Evans here.

ASSISTANT: Hello, how may I aid you today?

USER: I made a reservation earlier to attend business meet. But destination got changed recently. So I want to change my existing reservation. Can you help me in that?

ASSISTANT: Sure, I am happy to help you for that. Can you wait for a while I will let you know.

USER: Sure.

ASSISTANT: Thanks for your patience, sorry to say you that we have not found any reservation on your given name.

USER: OK, no problem.

ASSISTANT: Thank you for contacting us.

USER: Thanks for your time.