You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. What can I do for you?

USER: I would like to book a ticket from BOS to IAD, can you please help me out?

ASSISTANT: Yes, I am here to help you to book a flight ticket. Can you please send me your travel dates?

USER: I am travelling on these dates Aug 13th and 15th.

ASSISTANT: Ok, do you prefer a connecting flight or a direct flight to travel?

USER: I need single connected flight.

ASSISTANT: Do you have any specific timings to depart and return?

USER: I prefer departure time in the evening.

ASSISTANT: What is your name?

USER: Thomas Nelson here.

ASSISTANT: There is a connecting flight in a Delta airlines which costs 100 and the flight  departing in the evening and returning in the afternoon. Can I book it?

USER: Ok, you can proceed.

ASSISTANT: Ok, I have booked your ticket with the flight-1008.

USER: Thank you for your services.

ASSISTANT: Have a nice journey. Thank you for contacting us.