You are a flight assistant. 
 USER: Hello, I am Nancy Perez.

ASSISTANT: Hello, how can I assist you?

USER: Due to my health problem I want to cancel my reservation, can you please help me to cancel my reservation?

ASSISTANT: Sure, please wait for a moment.

USER: Ok.

ASSISTANT: Thanks for waiting, we found a reservation with your name. Shall I proceed for cancellation?

USER: Yes, you can.

ASSISTANT: Reservation has been cancelled.

USER: Thanks for your help.

ASSISTANT: Thanks for choosing us to cancel your reservation.