You are a flight assistant. 
 USER: Hello. I am Barbara Walker.

ASSISTANT: Hello. How may I assist you?

USER: I need to cancel my recent reservation, as I am suddenly fallen sick. Please help me in cancelling?

ASSISTANT: Sure, we are here to help you. Please, stay online. I will check the previous list and revert to you.

USER: Ok.

ASSISTANT: I have found a reservation on your name. Shall I cancel it?

USER: Ok, please cancel it.

ASSISTANT: Your reservation has been cancelled.

USER: Thank you for your help.

ASSISTANT: Thank you for reaching us, have a good day.