You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. What can I do for you today?

USER: Can you please book me a flight ticket from IAD to EWR.

ASSISTANT: Sure, on which date would you like to take off from IAD?

USER: My departure and arrival dates are Dec 16 and Dec 18.

ASSISTANT: Ok, May I know your class preference?

USER: Economy is preferable.

ASSISTANT: Ok, do you need any lay by in between the journey?

USER: Yes, I need a break in my journey.

ASSISTANT: Ok, at what time would you like to travel?

USER: Any time ok on that day.

ASSISTANT: We found a Spirit Airlines with fare of 200 and a lay by in between the journey matches your schedule.

USER: Sure, please proceed with the booking.

ASSISTANT: To proceed further I need your good name please?

USER: Scott Smith here.

ASSISTANT: Your ticket has been confirmed with flight number 1008 in economy class.

USER: Thank you for your service.

ASSISTANT: Thank you for connecting with us.