You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Gregory Hall here.

ASSISTANT: How can I assist you?

USER: I need to cancel my existing reservation, which is done recently. Can you please help me out?

ASSISTANT: Sure, I can help you with that. Please let me check you reservation status.

USER: Thank you for considering my request.

ASSISTANT: Gregory Hall, there is no reservation found under your name to do cancellation.

USER: Not a big problem, anyway thank you for the information.

ASSISTANT: Thank you for choosing us.