You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Joshua Nelson.

ASSISTANT: How may I aid you?

USER: I am planning to cancel my recent reservation, due to health issue.

ASSISTANT: Sure, I will help you. Please wait a moment.

USER: Thank you. Sure.

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

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

ASSISTANT: Thank you for approaching us.