You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I support you today?

USER: Ashley White here. I'm planning to visit Denver botanical gardens, can you please book a ticket from HOU to DEN?

ASSISTANT: Sure, please share your trip dates.

USER: Sure, my planned departure and return travel dates are 12/21 and 12/23.

ASSISTANT: Ok, do you have any specifications?

USER: Yes, I need 1 halt in between my journey.

ASSISTANT: Sorry to say that, there are no flights available on the routes of your journey.

USER: Oh! That's ok, thank you for giving the information.

ASSISTANT: Thank you for reaching us.