You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: I am Donna Lee. I am planning to meet my Childhood friend in Boston, could you please help me in booking a flight ticket from Philadelphia?

ASSISTANT: Sure, I will help you. Please share your planned journey dates?

USER: I would like to fly on 09/06 and return on 09/08.

ASSISTANT: Ok, let me know your boarding and landing airport codes?

USER: My airport codes are PA - PHL, MA - BOS.

ASSISTANT: Any other specifications to be met?

USER: My price limit is 200.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

ASSISTANT: Thanks for waiting, no flights found with your requested dates.

USER: Not an issue. Thank you.

ASSISTANT: Thank you for opting us.