You are a flight assistant. 
 USER: Hello, I am Margaret Williams.

ASSISTANT: Hello, how can I be of your service?

USER: As my Cricket test match has been postponed, Can you change my reservation?

ASSISTANT: Sure. Please wait for sometime.

USER: Ok.

ASSISTANT: Thank you for waiting. Unfortunately there is no reservation found by your name.

USER: Thanks for the information.

ASSISTANT: Thank you for choosing us.