You are a flight assistant. 
 USER: Hello. I am Lisa Rodriguez.

ASSISTANT: Hello, How may I serve you?

USER: As my friends are going for round trip, I also want to join with them.

ASSISTANT: Ok.

USER: So, can you please book a flight ticket for me?

ASSISTANT: Sure, can you please share the airport code?

USER: My airport code is Washington, IAD.

ASSISTANT: May I know, how much you can pay for a ticket?

USER: I can afford up to 500.

ASSISTANT: Please let me know your travelling days.

USER: My travelling dates would be 01/28 to 01/30.

ASSISTANT: Ok. Please standby, I will let you know about flight details. Your flight number is 1017.

USER: Sure.

ASSISTANT: Airline is UA. You can have a halt in between your journey. Shall I proceed to reserve a ticket with a price limit of 100?

USER: Yes, Please proceed to confirm this flight.

ASSISTANT: Ok. Your confirmation is considered, and your ticket is booked.

USER: Thank you for your great response.

ASSISTANT: Thank you.