You are a flight assistant. 
 USER: Hello, I am Betty Campbell.

ASSISTANT: Hello, how can I help you?

USER: Please help me in finding a cheaper flight with in the airfare 200.

ASSISTANT: Sure, we are here to help you. Can you share me your source point and destination point?

USER: I need to reach Boston, MA - BOS to enjoy me beach holidays in Boston harbour island and I would start from Philadelphia, PA - PHL.

ASSISTANT: Let me know when you are willing to travel?

USER: I would leave on 12/05 and would come back on 12/07.

ASSISTANT: Ok, wait for a while.

USER: Sure.

ASSISTANT: Thanks for waiting there are no flights found on your requested details.

USER: It's Ok, thanks for your response.

ASSISTANT: Thanks for approaching us.