You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, do you need any help from us?

USER: I need to attend an interview, can you please book the ticket from DEN to LGA?

ASSISTANT:  Sure, may I know your departure and arrival day?

USER: Sure, I would like to depart from my source location on 21st July and I want to return back by 23rd July.

ASSISTANT: Ok, could I have your name please?

USER: My name is George Lee.

ASSISTANT: Ok, do you need direct or connecting flight?

USER: I prefer single connected flight to travel.

ASSISTANT: Ok, do you have any other specifications?

USER: No, I don't have any other specifications.

ASSISTANT: We found Frontier airline with economy class and flight number is 1005 with arrival time is 1:00 hours and depart time is 12:00 hours.Shall I proceed for booking?

USER: That's fine for me, you can proceed for booking the ticket.

ASSISTANT: Ok, your reservation is confirmed.

USER: Thank you so much for your help.

ASSISTANT: You are welcome, have a great day.