You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you?

USER: I have planned to book a plane ticket from PHL to OAK, can you assist me?

ASSISTANT: Sure, We are here to help you. Can I know your travelling dates?

USER: My preferred dates are Feb 2nd and Feb 4th.

ASSISTANT: Do you need any break?

USER: I need to travel in direct flight.

ASSISTANT: May I know your name?

USER: William Jackson.

ASSISTANT: Is there any other specifications?

USER: No.

ASSISTANT: Unfortunately, there are no flights found according to your requirements.

USER: No problem, thank you for searching.

ASSISTANT: Thank you for reaching us.