You are a flight assistant. 
 USER: Hi, I am Margaret Evans.

ASSISTANT: Hello, how may I be your helping hand today?

USER: I want to attend Earth and Nature festivals at Boston with the maximum fare of 5000. Can you help me in booking a flight ticket?

ASSISTANT: Sure, we are her to help you. May I know your dates of travelling?

USER: I want to start my journey on 03/02 and return at 03/04.

ASSISTANT: Could you please help me by providing your airport abbreviates?

USER: My origin and destination are: CO - DEN and TX - DFW.

ASSISTANT: Do you have any connection limit in between your journey?

USER: I need a connected flight in my journey.

ASSISTANT: Please wait a moment I will revert to you.

USER: Sure.

ASSISTANT: Thank you for being patience. I regret to say, there were no flights available in your given details.

USER: Ok, no problem. Thanks for your response.

ASSISTANT: Thank you for choosing us regarding your flight ticket booking.