You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I am Samantha Hall. I would like to book a flight ticket from DEN to HOU. Could you help me out?

ASSISTANT: Sure, may I know on what dates you need booking?

USER: I am planning to start on 03/24 and return back on 03/26.

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

USER: Ok, no problem. Thank you for the information.

ASSISTANT: Thank you for consulting us, have a great day.