You are a flight assistant. 
 USER: Hello, I am Rachel Martin.

ASSISTANT: Hello, how can I serve you today?

USER: Due to bad weather the match has been postponed. Can you please help me out in changing my existing reservation?

ASSISTANT: Sure, please wait a moment.

USER: OK.

ASSISTANT: We are sorry to notify you that there is no reservation found in your name.

USER: Thanks for the information.

ASSISTANT: Thanks for choosing us.