You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Christine Miller.

ASSISTANT: How can I hand helping to you?

USER: I would like to change my reservation, can you please help me out?

ASSISTANT: Sure, I will check with that one, please give me some time.

USER: Thank you.

ASSISTANT: When I have checked in my ticket booking list there is no reservation found.

USER: Ok no problem, thank you for your services.

ASSISTANT: Thank you for reaching us, have a nice day.