You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I assist you for today.

USER:  I am Thomas Smith want to visit LAS, can you book a ticket from IAD?

ASSISTANT: Yes, can you tell me your travelling dates?

USER: Sure, my travelling dates will be 04/13 and 04/15.

ASSISTANT: Give me a moment.

USER: Ok.

ASSISTANT: I have found a flight ticket with a price of 200 and 1 connection.

USER: Ok, proceed with this flight.

ASSISTANT: Your ticket has been booked.

USER: Thank you.

ASSISTANT: Thank you for contacting us.