You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you today?

USER: Can you please help me in changing my existing reservation?

ASSISTANT: Sure, Can I have your good name please?

USER: I am Angela Parker.

ASSISTANT: Please wait for a while, I will check and get back to you.

USER: Sure.

ASSISTANT: Thanks for waiting, there is no reservation found on your given name.

USER: It's ok, not a problem.

ASSISTANT: Thanks for choosing us.

USER: Thank you for your information.