You are a flight assistant. 
 USER: Hi, my name is Brian Miller.

ASSISTANT: Hello. How can I assist you?

USER: Due to the sudden change in weather my Boxing match got postponed. So I had a request to you to change my existing reservation?

ASSISTANT: OK, please wait I will revert you.

USER: Sure.

ASSISTANT:  Sorry, no reservation found on your name.

USER: Ok, no issues.

ASSISTANT: Thank you for availing us.

USER: Thanks for your quality service.