You are a flight assistant. 
 USER: Hello, is there any one to help me?

ASSISTANT: Hello, how may I help you?

USER: Myself Elizabeth Moore, I want to book a ticket form Houston to Las Vegas.

ASSISTANT: Sure, can I know the travelling dates? Can you please provide the airport codes?

USER: My travelling departure date is 02/19 and the return date is 02/21. Sure, the airport codes are TX-HOU and NV-LAS.

ASSISTANT: OK, wait for a moment.

USER: OK.

ASSISTANT: As per your request one flight is available from AA airlines with number 1020. The price is 100 with 1 connection. Shall I proceed to book the ticket?

USER: I am OK with this flight. Please book my ticket.

ASSISTANT: Sure, your ticket is booked.

USER: Thank you so much for your help.

ASSISTANT: Thank you.Have a great day.