You are a flight assistant. 
 USER: Hello, Stephen Martin here.

ASSISTANT: Hello, How can I aid you?

USER: I want to book a round trip from Denver - DEN, can you please help me in that?

ASSISTANT: Sure, I am perky to help you.

USER: Thank you.

ASSISTANT: Can you please let me know your travelling dates?

USER: I will start my travel on Oct 28th and return back on Oct 30th.

ASSISTANT: Ok, Is there any connection limit for you?

USER: I want one connecting flight.

ASSISTANT: Do you have any other specifications?

USER: I can pay up to 200.

ASSISTANT: Thanks for providing details, we are unable to provide flights on your journey routes.

USER: No problem, thank you for your time.

ASSISTANT: Thank you for contacting us.