You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Michael Turner here.

ASSISTANT: Michael, how can I assist you?

USER: I am unable to travel due to some health issue, so please cancel my reservation.

ASSISTANT: Ok. Sorry, no reservation found by your name.

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

ASSISTANT: Thank you for contacting us.

USER: Welcome.