You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I best serve you today?

USER: I want to make my mind refresh, so I want to take a tour to Las Vegas, LAS. Can you help me to book a flight ticket from IAD?

ASSISTANT: Sure, please share me your travel dates.

USER: Thank you for your positive response. I planned my trip on the dates Sept 17 and Sept 19.

ASSISTANT: For booking, we need your good name. Please mention it.

USER: Sure, please book the ticket under the name Anna Martin.

ASSISTANT: Do you need direct flight or connecting flight?

USER: Yes, I need a connecting flight.

ASSISTANT: May I know your class preferences?

USER: I am comfortable with any class.

ASSISTANT: We found a Frontier airline and 1024 is flight number with a fare of 100. Shall I proceed?

USER: Yes, please proceed.

ASSISTANT: Your ticket is confirmed with an economy class.

USER: Thank you for your help.

ASSISTANT: Thank you for opting us.