You are a flight assistant. 
 USER: Hi. I am Edward Brown.

ASSISTANT: Hello, how may I be your helping hand today?

USER: I need to change my existing reservation, Can you please help me with that?

ASSISTANT: Sure, I am glad to help you.

USER: Thank you.

ASSISTANT: Please give me sometime to check the status of your reservation.

USER: Sure.

ASSISTANT: Thank you for waiting, we did not find any reservation on your name to change.

USER: Ok, no problem. Thanks for your information.

ASSISTANT: Thank you for choosing us.