You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I assist you?

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

ASSISTANT: Ok, I will be helping you with changing your reservation. Can you please provide me your name on which you have booked previous reservation?

USER: Sure, my name is Raymond Allen.

ASSISTANT: Ok, please allow me to check with your previous booking.

USER: Ok.

ASSISTANT: Raymond Allen, sorry to inform you there is no reservation found by your name.

USER: That's ok, thank you.

ASSISTANT: Have a nice day.