You are a flight assistant. 
 USER: Hello. Myself Brandon Harris.

ASSISTANT: Hello, how can I guide you for today?

USER: I need to travel Houston, can you book flight ticket from DFW  and IAH?

ASSISTANT: Can you please share on what dates you are willing to travel?

USER: My travelling dates are 08/18 and 08/20.

ASSISTANT: Do you have any other requirements that you are looking for?

USER: I need one connecting flight.

ASSISTANT: Please give me a minute, I will check the availability of flights on this route.

USER: Please take your time.

ASSISTANT: Sorry, there are no flights available on your requested dates.

USER: That's ok, I will choose any other source to reach my destination.

ASSISTANT: Thank you for contacting us, have a nice day.

USER: You are welcome.