You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I render you at this moment?

USER: I am Melissa Scott from Washington. I am planning to celebrate my birthday in Denver, can you help me in booking a flight ticket within a price limit of 200?

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

USER: Yes, I need a halt.

ASSISTANT: Ok, help me with your arrival and departure travelling dates?

USER: My departure day is 03/09, return day is 03/11.

ASSISTANT: Ok, how much you can afford for a flight ticket?

USER: My price limit is 200.

ASSISTANT: Ok, please share your near by airport codes?

USER: My source and destination airport codes are DC - IAD, CO - DEN.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

ASSISTANT: We found a 1001 southwest airline with fare of 200 matches your schedule. Shall I proceed with booking?

USER: You can reserve it.

ASSISTANT: Your ticket has been confirmed.

USER: Thank you.

ASSISTANT: Thank you for availing us.