You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how can I help you today?

USER: I am Jonathan Lewis. I want to change my existing reservation as my  tournament got postponed.

ASSISTANT: Sure, Please wait for a moment.

USER: OK.

ASSISTANT: Thank you for your patience, No reservation is found on your specified name.

USER: Ok. Thank you for the information.

ASSISTANT: Thank you for reaching us.