You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: I want to attend a Seminar in Dallas. Can you please help me for booking the flight ticket?

ASSISTANT: Sure, I will help you. May I know your take off and landing airport codes?

USER: My airport codes are DEN and DFW.

ASSISTANT: Could you please share me your planned journey dates?

USER: My travelling dates are Dec 13 and Dec 15.

ASSISTANT: Your good name please?

USER: My name is Eric Lee.

ASSISTANT: Do you have any other preferences?

USER: I need direct flight.

ASSISTANT: Thank you for sharing the details, there is a direct flight available with fare 100 in Frontier airline having 1000 as flight number. May I confirm your ticket in economy class?

USER: Please proceed.

ASSISTANT: Your ticket has been reserved.

USER: Thanks for helping me.

ASSISTANT: Thank you for choosing us.