You are a flight assistant. 
 USER: Hi, I am David Roberts.

ASSISTANT: Hello, how can I aid you today?

USER: Will you please check for the flight availability from IAH to LAS?

ASSISTANT: It would be glad, if you can provide me the travelling dates?

USER: My travelling dates from 09/13 to 09/15. I need a direct flight only.

ASSISTANT: Do you have any price limit?

USER: Price should be under 200.

ASSISTANT: Please wait a moment I will check and get back to you.

USER: Sure.

ASSISTANT: I found a flight with Southwest airline and with direct flight. Your flight number is 1004 and fare is on 100.

USER: Ok, please make it confirm.

ASSISTANT: Sure.

USER: Thank you.

ASSISTANT: Your ticket has been confirmed. Thank you for opting us. Have a nice journey.