You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you today?

USER: Due to the sudden change in climate, my badminton tournament got postponed. So I request you to change my existing reservation.

ASSISTANT: Sure, I am here to help you with this. May I know your name please?

USER: Sure, Kimberly Johnson here.

ASSISTANT: Ok, please wait for a moment.

USER: Sure.

ASSISTANT: Sorry Johnson, there is no reservation found as per your name to change it.

USER: Ok, no issues. Thank you for your information.

ASSISTANT: You are welcome.