You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: I am David Robinson. I am planning to cancel my recent reservation, due to health issue. Can you please help me out?

ASSISTANT: Ok, please wait for a while I will be back with your current status of reservation.

USER: Sure, I will wait.

ASSISTANT: Thanks for your time, there is no reservation found with your name in our database.

USER: That's fine, thank you for your information.

ASSISTANT: Thanks for choosing us.