You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: I want to change my existing reservation because my car has break down so I may not reach the airport I had booked on the name Susan Mitchell. Can you help me?

ASSISTANT: Sure, I will help you. Please wait a while.

USER: Ok, take your time.

ASSISTANT: There is no reservation on your name in our database.

USER: That's ok, may it is been cancelled before only. Anyways thank you for the information.

ASSISTANT: Thank you for reaching us.