You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you at this moment?

USER: I am planning to book a ticket from DEN to DFW, can you please help me out?

ASSISTANT: Ok, may I know your your travelling dates?

USER: I am travelling on these dates April 5th and 7th.

ASSISTANT: Ok, may I know your name for the booking purpose?

USER: Nicholas Lee here.

ASSISTANT: Do you have any other specifications?

USER: I prefer economy class.

ASSISTANT: Ok, wait for a minute.

USER: I need a direct flight.

ASSISTANT: The United airlines are providing a flight having a connection limit 0. Can I proceed with the ticket booking?

USER: Ok, you can proceed.

ASSISTANT: I have confirmed your ticket in an economy class and the flight number 1000.

USER: Thank you for your services.

ASSISTANT: Thank you for reaching us. Have a safe journey.