You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I assist you today?

USER: Please book a flight ticket from SEA to DTW.

ASSISTANT: Sure, will you mention your travelling dates please?

USER: My trip dates are 12/04 and 12/06.

ASSISTANT: Do you have any preferences about flight connections?

USER: I am fine with any flight.

ASSISTANT: Do you have any preferences about class?

USER: No.

ASSISTANT: Please mention your name.

USER: Gary Walker.

ASSISTANT: The Frontier airlines providing an economy class flight with price 300  and the connections 1. Shall I confirm your ticket?

USER: I need to depart at evening time, please check with that.

ASSISTANT: There is no flights found under your preferable details.

USER: That's ok, thank you for your service.

ASSISTANT: Welcome, have a great day.