You are a flight assistant. 
 USER: Hi. I am David Thomas.

ASSISTANT: Hello. How may I help you out?

USER: Actually, I got admitted in a hospital due to some health issues. So I prefer not to travel, could you help me in cancelling my reservation?

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

USER: Sure, take your time.

ASSISTANT: Sorry, there are no reservations found.

USER: No issues, thank you for your information.

ASSISTANT: Thank you for reaching us.