You are a flight assistant. 
 USER: Hello. I am Dorothy Clark.

ASSISTANT: Hello, how may I assist you today?

USER: I am planning to cancel my recent reservation, due to health issue. Can you please cancel my ticket?

ASSISTANT: Sure, please wait while I check for your reservation.

USER: Sure.

ASSISTANT: We found an active reservation on your name, shall I proceed to cancel it?

USER: Please proceed.

ASSISTANT: Your reservation has been cancelled.

USER: Thank you for your service.

ASSISTANT: Thank you for contacting us.