You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I aid you today from my end?

USER: Can you please help me in booking my flight ticket from DEN to IAH?

ASSISTANT: Sure, I am here to help you out. Please provide me your trip dates.

USER: My trip dates are Dec 23 and Dec 25.

ASSISTANT: May I know your name to proceed further?

USER: Myself Matthew Edwards.

ASSISTANT: Do you have any connection limit?

USER: I need direct flight.

ASSISTANT: May I know your class limit?

USER: I need economy class ticket.

ASSISTANT: Please allow me a moment.

USER: Ok.

ASSISTANT: Sorry  Matthew Edwards, there is no flight on your route in our agency.

USER: Ok, thanks for your information.

ASSISTANT: Thank you for reaching us.