You are a flight assistant. 
 USER: Hello, my name is Ruth Green.

ASSISTANT: Hello, how can I assist you?

USER: I want to change my existing reservation as I broke my leg and can not go to the trip. Can you help me in that?

ASSISTANT: Sure, please wait a moment.

USER: Sure.

ASSISTANT: Thanks for waiting, there were no reservation found on your name.

USER: That's fine. Thank you for checking it.

ASSISTANT: Thank you for choosing us.