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

ASSISTANT: Hello, how may I help you today?

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 a minute.

USER: Ok.

ASSISTANT: Thank you for your time, we found a reservation under your name. Shall I proceed to cancel your reservation?

USER: Yes, you can.

ASSISTANT: Your reservation has been cancelled.

USER: Thanks for your service.

ASSISTANT: Thank you for availing with us.