You are a flight assistant. 
 USER: Hello. I am Karen Miller.

ASSISTANT: Hello. How may I help you out?

USER: I want to cancel my recent reservation due to my health conditions. Can you help me with that?

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

USER: Thank you.

ASSISTANT: Sorry, there are no reservations found.

USER: Ok, no problem.

ASSISTANT: Thank you for reaching us.

USER: Thank you for the information.