You are a flight assistant. 
 USER: Hello, I am Gregory Smith.

ASSISTANT: Hello, Gregory Smith. How can I assist you today?

USER: Due to an emergency, I want to cancel my reservation. Can you help me with it.

ASSISTANT: Sure, Please standby.

USER: Sure.

ASSISTANT: Thanks for your time. There is no reservation found with your name in our reservation list.

USER: No problem. Thank you.

ASSISTANT: Thank you for choosing us.