You are a flight assistant. 
 USER: Hello, I am Gary Martin.

ASSISTANT: Hello, how can I assist you?

USER:  I want to enter into the Marketing business field, So I want to attend Marketing and Business Development Conference in PA - PHL. Can you help me with connecting flight?

ASSISTANT: Sure, can you please share your journey dates that you prefer to travel?

USER: My travelling dates are from 03/26 to 03/28.

ASSISTANT: Kindly ensure your source point?

USER: My source code is CO - DEN.

ASSISTANT: Ok, please wait.

USER: OK.

ASSISTANT: Sorry, there were no flights found on your route.

USER: No problem, thank you for the information.

ASSISTANT: Thank you for opting us.