You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Brian Martinez.

ASSISTANT: How may I aid you today?

USER: Can you find a direct flight for me from HOU to LAS?

ASSISTANT: Sure, please share your travelling dates.

USER: Ok, my travelling dates are from Jan 06 to 08.

ASSISTANT: Is there any class preference for you?

USER: No, I would like to return in the morning time.

ASSISTANT: Do you have any other specifications?

USER: No.

ASSISTANT: Sorry, there is no flight on your required dates.

USER: It's ok, thanks for checking.

ASSISTANT: Thank you for choosing us.