You are a flight assistant. 
 USER: Hello. I am Alexander King.

ASSISTANT:  Hello, How exactly I can serve you the best today?

USER: I want to cancel my recent reservation due to my health problem, help me in cancelling my reservation.

ASSISTANT: Sure, I will help you with that. Please wait a while.

USER: Sure.

ASSISTANT: Thank you for waiting. I have checked in reservation list to cancel your ticket, but could not find any reservation with your name.

USER: Not an issue, thank you for your assistance.

ASSISTANT: Thank you for reaching us.