You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I amend you?

USER: I am Betty Smith. Please change my existing reservation, because I want to change my business trip to other place.

ASSISTANT: Sure, please wait.

USER: Ok.

ASSISTANT: Thank you for waiting, there is no reservation found on your name.

USER: Ok.

ASSISTANT: Thank you for waiting with us.

USER: Thank you.