You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you today?

USER: I want to change my existing reservation as my tournament got postponed. Can you help me with this intent?

ASSISTANT: Sure, I will help you with this. May I know your name please for further process?

USER: Sure, my name is Linda Gonzalez.

ASSISTANT: Ok, please wait for a mean while.

USER: Ok.

ASSISTANT: Sorry Linda, there is no reservation found as per your name to change your reservation.

USER: That's ok, thank you.

ASSISTANT: You are welcome and have a great day.