You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello,.

USER: I am Barbara Lewis.

ASSISTANT: OK, How can  I assist you?

USER: I have an issue with my existing reservation as my tournament has been postponed. So I want to change my reservation.

ASSISTANT: Sure, can you please provide your reservation details? There is no reservation found  by your name.

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