You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you today?

USER: I am Anthony Perez, I need a flight to Philadelphia, PA-PHL to visit Independence hall. Can you help me with booking?

ASSISTANT: Sure, could you please share your origin point?

USER: My source point is Oakland and airport code is OAK.

ASSISTANT: Sure, please mention your price limit and preference connections?

USER: I want to spend 200 for flight ticket. It is better to get a flight with one connection.

ASSISTANT: Ok, please assign your planned dates?

USER: I will travel on 04/14 and return on 04/16.

ASSISTANT: Ok, please hold a moment, let me search a flight for you.

USER: sure.

ASSISTANT: Thanks for your valuable time, sorry, unfortunately no flights matching your criterion.

USER: Thanks for the information.

ASSISTANT: Thanks for connecting with us, have  a joyful journey.