You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you at this moment?

USER: I am Melissa Clark from Washington. I want to go Washington next week, can you please book a flight ticket for me?

ASSISTANT: Sure, I am oblige to help you. Can you please provide your planned dates of travelling?

USER: Thank you, I want to take off on 01/12 and book my return ticket also on 01/14.

ASSISTANT: Ok, may I know your origin and destination airport codes for booking?

USER: I want to fly from DCA and destination airport is DCA.

ASSISTANT: Please wait a moment to check the flights availability.

USER: Ok.

ASSISTANT: Based on your information, UA airline is ready to serve you with 1 connection with a minimum fare of 200 is available for you. Shall I proceed with this?

USER: I am ok with this flight, please proceed.

ASSISTANT: Ok, your ticket has been booked in flight number 1005.

USER: Thank you for your help.

ASSISTANT: Thank you for using our services, have a great journey.