You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: I would like to do some changes in my existing reservation, can you help me in that?

ASSISTANT: May I know your name please to proceed further?

USER: Sure, the ticket has been reserved on the name Dorothy Thompson.

ASSISTANT: Dorothy Thompson, no reservation found as per your preferences.

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

ASSISTANT: Thank you for choosing us.