You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I help you today?

USER: I made a reservation earlier to attend an international conference, it has been postponed, and again it has to start in the next week. So I want to change my reservation. Can I have your help?

ASSISTANT: Sure, May I know your name?

USER: My name is Justin Green.

ASSISTANT: There is no reservation found with your name.

USER: Ok, no issues. Thanks for the response.

ASSISTANT: Ok, Thanks for choosing us.