You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you out?

USER: Can you please book a flight ticket from DEN to SEA?

ASSISTANT: Sure, I will help you in booking the ticket. May I know your travelling dates please?

USER: Thank you. I have planned my travel  dates as Apr 21 and Apr 23.

ASSISTANT: Can I know your name please?

USER: Sure, myself James King.

ASSISTANT: Do you need any specifications?

USER: I am looking for single connecting flight.

ASSISTANT: Can I know your other preferences?

USER: I do not have any other specifications.

ASSISTANT: There is a flight with connection 1 and price 200, can I proceed?

USER: That is fine, please proceed with booking.

ASSISTANT: Ok, your ticket has been booked with flight number 1012.

USER: Thank you for your help.

ASSISTANT: Thank you for reaching us.

USER: Most welcome.