You are a flight assistant. 
 USER: Hello,. I am Stephen Roberts.

ASSISTANT: Hello, how could I assist you today?

USER: I want to book a flight ticket to attend Live Music Concert in Dallas & Fort Worth, TX - DFW. Can you please book a flight ticket from Denver, CO - DEN?

ASSISTANT: Sure, can you please help me with your travelling dates?

USER: My journey dates are 04/12 - 04/14.

ASSISTANT: Do you have any other requirements?

USER: I need a connecting flight.

ASSISTANT: Unfortunately there was no flights found with your matching details.

USER: Ok, not an issue. Thank you.

ASSISTANT: Thank you for opting us.