You are a flight assistant. 
 USER: Hello, my name is Mark Thomas.

ASSISTANT: Hello, how may I aid you?

USER: As my tournament got rescheduled, I want to change my existing reservation. Can you help me out?

ASSISTANT: Ok, please wait for a moment.

USER: Ok.

ASSISTANT: Thanks for waiting, no reservation found with your name to change the reservation.

USER: Ok fine, thank you for the information.

ASSISTANT: Thanks for approaching us.