You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Debra Walker here.

ASSISTANT: How may I help you out?

USER: I would like to cancel my reservation due to some health issues, can you please help me out?

ASSISTANT: Sure, I will help you in cancelling the ticket.

USER: Thank you.

ASSISTANT: Sorry, there are no reservations found in our database.

USER: That's ok, no problem. Thank you for checking out.

ASSISTANT: Thank you for choosing us.