You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: I am David Rodriguez.

ASSISTANT: Yes, David.

USER: I would to cancel my reservation as I leaving for business meet, can you please help me out?

ASSISTANT: Sure, I will help you out. Please wait a moment, let me check the previous reservation details.

USER: Ok.

ASSISTANT: Sorry David, no reservation found on your name.

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

ASSISTANT: Thank you for reaching us.