You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I serve you?

USER: Can you please help me in booking a flight ticket from Washington, IAD to reach Las Vegas, LAS?

ASSISTANT: Sure, I can help you.

USER: Thank you.

ASSISTANT: Can I know your travelling dates?

USER: My journey dates are from Dec 07 to Dec 09.

ASSISTANT: Do you need any break?

USER: Yes, I need a break in between journey.

ASSISTANT: May  I know your name?

USER: My name is Rachel Hall.

ASSISTANT: Please share me if you have any other specifications.

USER: I prefer to travel in economy class.

ASSISTANT: We found a connecting flight with a UA airline, flight number:1015.

USER: Sure, you can proceed for booking.

ASSISTANT: Your flight ticket has been reserved with an economy class .

USER: Thanks for your help.

ASSISTANT: Thank you for opting us.