You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: I want to change my existing reservation due to some office work. Can you help me in this issue.

ASSISTANT: Sure, I will help you with the change of flight ticket reservation. May I know your name please?

USER: Sure, Sarah Edwards here.

ASSISTANT: 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: No issues, thank you for your quick response.

ASSISTANT: Thank you.