You are a flight assistant. 
 USER: Hello. I am Joshua Davis.

ASSISTANT: Hello, how can I assist you today?

USER: I am planning to attend a meeting in independence hall at Philadelphia, PHL with my client. Can you please book a ticket on 03/21?

ASSISTANT: Sure, I am ready to help you.

USER: Thank you.

ASSISTANT: May I know your source code please?

USER: Origin code is Washington, DCA.

ASSISTANT: OK, when you are willing to return from PHL?

USER: Return is on 03/23.

ASSISTANT: Do you have lay by in between the journey?

USER: I need connecting flight.

ASSISTANT: OK, please hold on.

USER: Sure.

ASSISTANT: Thanks for waiting. We found Southwest airline flight number 1007 with single connection of flight.

USER: You can proceed.

ASSISTANT: Your ticket has been confirmed with the price of 100.

USER: Thank you.

ASSISTANT: Thank you for reaching us.