You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I aid you?

USER: I am Barbara Evans. Can you help me to change my recent reservation?

ASSISTANT: Yes, please I will help you with change of flight ticket booking. Wait for a moment please.

USER: Sure.

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

USER: That's fine, thanks for your help.

ASSISTANT: Thank you.