You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: My name is Alexander Walker.

ASSISTANT: How may I help you, Walker?

USER: The doctor has cancelled the appointment for me. So, can you please cancel my reservation?

ASSISTANT: Sure. Please wait a minute while I check for the status of your reservation.

USER: Ok, take your time.

ASSISTANT: Walker, no reservation has been found on your name in our database.

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

ASSISTANT: Thank you for approaching us.