You are a flight assistant. 
 USER: Hello, I am William Miller.

ASSISTANT: Hello, how may I aid you?

USER: Due to the bad weather conditions, match has been postponed. Can you please change my existing reservation?

ASSISTANT: Sure, please give me a minute.

USER: OK.

ASSISTANT: Thanks for spending your time. There is no reservation found in the database on your specified name.

USER: OK, no problem.

ASSISTANT: Thanks for connecting with us.

USER: Thanks for the information.