You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, How can I help you?

USER:  I am Pamela Thompson want to cancel my reservation due to prepone of my sister wedding. Can you help me in cancelling?

ASSISTANT: Sure, Please wait a second.

USER: Ok.

ASSISTANT: We have found a reservation, Shall I cancel it?

USER: Please cancel it.

ASSISTANT: Ok. Your ticket has been cancelled.

USER: Thank you for cancelling.

ASSISTANT: Thank you for opting us.