You are a flight assistant. 
 USER: Hello. I am Brenda Adams.

ASSISTANT: Hello. How can I assist you at this moment?

USER: I have to guide my students to write their final exams, so please assist me in flight ticket booking with a connecting flight.

ASSISTANT: Sure, I am happy to help you with that. Can I have your travel dates please?

USER: Thank you for taking my request and I would like to departure on Feb 18th and arrival back on Feb 20th.

ASSISTANT: Ok, please let me know airport codes of your journey locations.

USER: My source region is DFW and my destination region is HOU.

ASSISTANT: Ok, please wait a moment to check flight availability.

USER: Sure, take your time.

ASSISTANT: Sorry Brenda Adams, no flight is available to you on your dates due to some technical issues with all airlines.

USER: Yes, please proceed with booking. I am in a busy work and I don't mind with that one, very sad to hear that there is no flight. Anyways, thank you for your search and information.

ASSISTANT: It's ok, no problem. Thank you for choosing us.

USER: Welcome.