You are a flight assistant. 
 USER: Hello, I am Brian Young.

ASSISTANT: Hello, How may I help you?

USER: I want to move from LAS to HOU, Can you help me in booking a ticket?

ASSISTANT: Sure, I will help you. Can you please let me know your journey dates?

USER: I will Depart on 12/28 and I want to return on 12/30, Make sure that I want a direct flight with price limit 1000.

ASSISTANT: Ok, Give me a minute please.

USER: Sure.

ASSISTANT: Thanks for being patience. Sorry to inform you that, There was no flight available that matches with your requirements.

USER: Ok, Thank you for your information.

ASSISTANT: Thanks for choosing us.