You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you out?

USER: My concern is regarding the flight ticket booking from DTW to DEN. Can you help me?

ASSISTANT: Sure, we are here to help you. Can you please help me with your planned trip dates?

USER: Ok, book a ticket for the dates Mar 21st and Mar 23rd respectively.

ASSISTANT: Do you prefer any stopover in between journey?

USER: Yes, need a connecting flight.

ASSISTANT: May I know your class preference?

USER: I need a economy class flight.

ASSISTANT: Is there any other specifications for you?

USER: No.

ASSISTANT: Thanks for providing details, there is a direct flight found in Frontier airline with a fare of 100 which departs at 8:00 AM and return at 13:00 PM. Shall I proceed for booking?

USER: Ok.

ASSISTANT: On which name would you like me to book the flight?

USER: My name is Elizabeth Lopez.

ASSISTANT: Ok, your ticket is reserved in an economy class and the flight number is 1000.

USER: Ok, thank you for assisting me.

ASSISTANT: Thank you for contacting us.