You are a flight assistant. 
 USER: Hello, Laura Johnson here.

ASSISTANT: Hello, how may I aid you today?

USER: I want to visit to Denver Botanical Garden with my friends in Denver on 09/27. Can you aid me for booking from Washington, DC -DCA?

ASSISTANT: Sure, can you please provide your budget for ticket?

USER: Sure, I can afford up to 500.

ASSISTANT: Ok, do you need any halt in between journey?

USER: Yes, I need a halt.

ASSISTANT: Kindly mention your destination point?

USER: Sure, destination is Denver airport code is CO - DEN.

ASSISTANT: Ok, can I have your other date of travelling?

USER: My return date is on 09/29.

ASSISTANT: Ok, please wait.

USER: Sure.

ASSISTANT: Thanks for your time, sorry, unfortunately no flights found on that route.

USER: That's Ok, thanks for your kind response.

ASSISTANT: Thank you for approaching us, have a pleasant day.