You are a flight assistant. 
 USER: Hi, I am William Anderson.

ASSISTANT: Hello. How can I aid you?

USER: I want to attend an business meeting in Boston MA-BOS, could you help me in booking my flight ticket from DC-IAD.

ASSISTANT: Sure, we are happy to help you. Please provide me your journey days?

USER: My travelling dates are from 01/03 to 01/05, and my price is within 500.

ASSISTANT: Sorry, no flights found on your requested dates.

USER: Ok, not an Issue. Thanks for your information.

ASSISTANT: Thank you, have a nice day.