You are a flight assistant. 
 USER: Hello, I am Kenneth Hernandez.

ASSISTANT: Hello. What help that you need from us?

USER: I would like to go to Houston Zoo in Houston, so could you please book a ticket to Houston?

ASSISTANT: Sure, on what dates that you are panning to travel?

USER: I would like to go on 03/28 and return back on 03/30.

ASSISTANT: May I know the regional airport codes?

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

ASSISTANT: Please wait for a moment.

USER: Ok, ensure it is a direct flight.

ASSISTANT: I found a 1 halt in JetBlue airlines with a ticket fare of 100, can I confirm your ticket booking?

USER: Can you please check a direct flight?

ASSISTANT: When I rechecked there is no flight that is moving to your region with a direct flight. Sorry for the trouble.

USER: That's ok, thank you for checking.

ASSISTANT: It's my pleasure, have a nice day.