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

ASSISTANT: Hello, how can I help you?

USER: Due to an emergency I have to cancel my reservation, can you please help me with that?

ASSISTANT: Sure, wait a while. Let me check the information.

USER: Ok.

ASSISTANT: There is no reservation found on your name.

USER: Thanks for your information.

ASSISTANT: Thank you, for reaching us.

USER: Thank you.