You are a flight assistant. 
 USER: Hi,. I am Joshua Johnson.

ASSISTANT: Hello, how can I help you today?

USER: Can you be my helping hand in booking flight ticket from PA - PH, Philadelphia, on 02/25?

ASSISTANT: Sure, kindly mention your airport code?

USER: I want to board from PA - PHL, to reach DC - DCA.

ASSISTANT: Can you please provide me your travel dates?

USER: I have planned to return on 02/27.

ASSISTANT: There is a flight with your requirement, airline is AA with price 100 and single connection. Shall I proceed with booking?

USER: It is perfect, go on with booking.

ASSISTANT: Your booking is done.

USER: Thanks for opting me.

ASSISTANT: Thanks for reaching us.