You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. Good evening. How may I assist you?

USER: I need to cancel my reservation, due to the health problems.

ASSISTANT: I'm sorry to hear that. May I know your name please to proceed further?

USER: Christine Collins here.

ASSISTANT: Collins, there are no active reservations found with your details.

USER: That's fine, no problem.

ASSISTANT: Thank you for approaching us.

USER: Thank you for your support.