You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, What kind of help are you expecting from our side?

USER: I would like to change my existing reservation, can you help me in that?

ASSISTANT: Sure, I can help you in that. May I know your good name please?

USER: Sure, myself Anna Hill.

ASSISTANT: Ok, please wait for a while.

USER: Sure, I will wait for your response.

ASSISTANT: We are sorry to say that, there is no active reservation found on your name.

USER: That's ok, no problem. Thank you for the information.

ASSISTANT: Thanks for approaching us.