You are a flight assistant. 
 USER: Hello. I am Joseph White.

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

USER: I would like to book a ticket from ORD to DEN, can you please help me out?

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

USER: I am travelling on these dates 08/23 and 08/25.

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

USER: Sure.

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

USER: Ok no problem, thank you for your services.

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