You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello,.

USER: I am John Anderson.

ASSISTANT: How may I assist you?

USER: I need to book a flight ticket to Las Vegas, NV - LAS for attending sports meeting. Can you help me in booking?

ASSISTANT: Please provide your journey dates?

USER: 01/20 and 01/22 are my travelling dates.

ASSISTANT: Please mention boarding airport code?

USER: Houston, TX - IAH is my origin.

ASSISTANT: Please specify connections limit?

USER: I need a connecting flight.

ASSISTANT: Ticket is available with airline AA, price 200 having flight number 1023.

USER: Please proceed for booking.

ASSISTANT: Ticket is booked.

USER: Thanks for booking my ticket.

ASSISTANT: Thanks.