You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: I want to change my existing reservation. Could you help me with that?

ASSISTANT: Sure, I am here to help you. May I know your name?

USER: Emily Moore.

ASSISTANT: Ok, please wait for a while.

USER: Ok.

ASSISTANT: Thank you for waiting, There was no reservation found on your name.

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

ASSISTANT: Thank you for choosing us.