You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. Can I know your concern?

USER: I need to schedule my trip to visit Philadelphia to meet physiotherapist. Can you please help me in reserving the ticket from OAK to PHL?

ASSISTANT: Ok, please can I know your dates of your journey?

USER: I am planning my trip on July 23 and again I will be return back on July 25.

ASSISTANT: Ok, please can I know your specifications?

USER: I am flexible to travel in direct flight.

ASSISTANT: Ok, please provide me your other intents.

USER: No, I don't have any other credentials.

ASSISTANT: Please let me know your name to book a ticket.

USER: Myself Ryan Williams.

ASSISTANT: Sorry, there are no flights available as per your credentials. Thank you for choosing our agency.

USER: Not a big deal, anyhow thank you very much for your kind information.