You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I assist you for the day?

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

ASSISTANT: Ok, can you please mention the month of your previous booking so I will be able to check with your reservation by your name.

USER: Sure, my name is Nicole Davis.

ASSISTANT: Please allow me to check with your existing reservation for a moment.

USER: Ok.

ASSISTANT: I am so sorry to inform you that there is no flight reservation available, sorry for the inconvenience by our airlines.

USER: That's ok, thank you.

ASSISTANT: Thank you for choosing us, have a nice day.