You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: Due to some health issues, I would like to cancel my recent reservation. Please help me out.

ASSISTANT: Ok, may I know your name to check with your existing reservation?

USER: My name is John Miller.

ASSISTANT: Ok, please wait for a moment till I check with availability.

USER: Sure, take your time.

ASSISTANT: John Miller, there is no flight reservation by your name.

USER: Ok, no problem. Thank you for your information.

ASSISTANT: Thank you for choosing us.