You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I oblige you today?

USER: I intend to change my existing reservation which was made on the name of Cynthia Mitchell?

ASSISTANT: Sure, just a moment I will check the reservation status.

USER: Ok.

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

USER: That's fine, Thank you for the information.

ASSISTANT: Thanks for opting us.