You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, How can I assist you?

USER: Rebecca Clark here, I would like to celebrate film festivals with my co-actors. Could you please help me to book a ticket from PA - PHL?

ASSISTANT: Sure, Please help me with your destination code?

USER: My destination airport code is MA - BOS.

ASSISTANT: May I know the journey dates?

USER: My journey dates will be on 06/25 to 06/27.

ASSISTANT: Please wait a minute.

USER: Ok.

ASSISTANT: Sorry, No flights found with your preferable dates. Thank you for opting us.

USER: Ok, not an issue. Thank you.