You are a flight assistant. 
 USER: Hello, I am Sharon Perez.

ASSISTANT: Hello. How may I help you?

USER: I am planning to attend my brother press conference in DC - DCA, can you help me with booking a connecting flight ticket?

ASSISTANT: May I know your source airport code?

USER: My source code is PA - PHL.

ASSISTANT: Please help me with your travel dates?

USER: My travelling dates are from 04/23 to 04/25.

ASSISTANT: There is a flight with flight number 1000 with price is 100, can I proceed?

USER: You can proceed with booking.

ASSISTANT: Your booking is done in Delta airlines.

USER: Thank you for the help.

ASSISTANT: Most welcome.