You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, may I know your name please?

USER: I already have a reservation to attend an political meeting, due to some problems meeting place has been changed. So, I want to change my existing reservation, can you please help me with that?

ASSISTANT: Sure.

USER: My name is Nancy Mitchell.

ASSISTANT: Thanks for providing your name, please wait for a moment.

USER: Sure.

ASSISTANT: Sorry, no reservation found with your name.

USER: Ok, not an issue.

ASSISTANT: Ok, thanks for choosing us.

USER: Thank you for your information.