You are a flight assistant. 
 USER: Hi, my name is Kevin Edwards.

ASSISTANT: Hello. How can I help you?

USER: I would like to travel from Houston, TX - IAH to Las Vegas, NV - LAS to do trekking in Red Rock.

ASSISTANT: Could you please send me your travelling dates?

USER: They are on 02/24 and 02/26. And make sure that price limit should be 200 with a direct flight.

ASSISTANT: Please wait a while.

USER: Ok.

ASSISTANT: Thanks for being waiting. Unfortunately, There is no flight that matches according to your requriments.

USER: Ok, thank you for your help.

ASSISTANT: Thanks for consulting us.