You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Margaret Miller.

ASSISTANT: How can I help you?

USER: Due to the postponement of my cricket match. I want to change my reservation.

ASSISTANT: Sure, just a second please. I am sorry no reservation found on your name.

USER: It's fine. Thank you for your immediate response.

ASSISTANT: Thank you for choosing us.

USER: You are welcome.