You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I aid you?

USER: My name is Susan Campbell, can you help me to change my reservation?

ASSISTANT: Sure, I will help you with the change of flight reservation.

USER: Sure, take your time.

ASSISTANT: Ok. Thanks for waiting. But I am sorry to say that there is no reservation on your name to change it.

USER: Ok, no problem.

ASSISTANT: Thank you.

USER: Thank you.