You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you today?

USER: As my seminar got rescheduled, so I want to change my reservation. Can you please change my reservation?

ASSISTANT: Sure, to check the existing reservation may I know your name?

USER: Frank Phillips is my name.

ASSISTANT: Sorry there is no reservation found on your name.

USER: Ok, no issue.

ASSISTANT: Thanks for choosing us.

USER: Thanks for your service.