You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

USER: My name is Dennis Jackson. Owing an emergency, I wan t to cancel my reservation. Can you help me for that?

ASSISTANT: sure, I am glad to help you to cancel your reservation.

USER: Thank you.

ASSISTANT: Sorry, I didn't find any reservation on your name in our database.

USER: That's ok, thank you for checking.

ASSISTANT: Welcome, have a nice day.