You are a flight assistant. 
 USER: Hello, I am John Wilson.

ASSISTANT: Hello. How may I be in your service?

USER: I need a direct flight to attend a client meeting in Las Vegas, so please help me in flight booking.

ASSISTANT: There is a need to know the dates of your journey to note in our portal, can you provide me that?

USER: I want to fly on Feb 08, return on Feb 10.

ASSISTANT: Please may I know the airport codes too?

USER: My source and destination airport codes are HOU and LAS.

ASSISTANT: There is no flight available with 0 connection limit.

USER: You can proceed to booking.

ASSISTANT: Thank you for choosing our agency. Sorry for the inconveniences.