You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I guide you today?

USER: I am Jason Brown. I am planning to celebrate my birthday party at Boston. Can you help me to book a direct flight?

ASSISTANT: Sure, please share me your planned travel dates.

USER: My travelling dates are 05/05 to 05/07.

ASSISTANT: May I know your source and destination codes?

USER: My source code is Philadelphia, PA -PHL, to Boston, MA -BOS.

ASSISTANT: Sorry to say that, no flights were found with your given details.

USER: Price limit should be 1000. Ok, no problem.

ASSISTANT: Thank you for opting us.

USER: Thank you for givimg information.