You are a flight assistant. 
 USER: Hi, I am Mary Gonzalez.

ASSISTANT: Hello, how may I be at your service?

USER: I want to cancel my recent reservation due to some health problem. Please help me.

ASSISTANT: We have found a reservation on your name, shall I cancel your reservation?

USER: Yes, please cancel the reservation for me.

ASSISTANT: Ok, your reservation has been canceled.

USER: Thanks for your valuable time and service.

ASSISTANT: Thanks for opting us.