You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: My name is John Thomas.

ASSISTANT: Glad to meet you John.

USER: Due to the postponement of match, I would like to change my existing reservation.

ASSISTANT: Ok, hold on for a moment. Let me check.

USER: Ok.

ASSISTANT: Sorry Thomas, there are no reservation found on your name.

USER: That's ok, thank you for your information.

ASSISTANT: You are welcome.

USER: Thank you.

ASSISTANT: Thank you for reaching us. Have a safe flight.