You are a flight assistant. 
 USER: Hello. I am Rachel Green.

ASSISTANT: Hello. How may I assist you?

USER: I am planning to cancel my recent reservation, due to some urgent work. Can you please help me out?

ASSISTANT: Yes, I can help you.

USER: Sure.

ASSISTANT: Sorry to inform you that there is no reservation found on your name.

USER: That's fine. Thank you for your service.

ASSISTANT: Thank you for contacting us.