You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Mary Allen.

ASSISTANT:  How can I amend you?

USER: I want to cancel my reservation due to postpone of my interview at Houston. Can you cancel my reservation?

ASSISTANT: Ok, please wait I will revert you.

USER: Ok.

ASSISTANT:  We found reservation on your name, can I cancel it?

USER: Cancel it.

ASSISTANT:  Your ticket is cancelled.

USER: Thank you.

ASSISTANT: Thank you for availing us.