You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: Can you please help me to book a flight ticket from OAK to PHL?

ASSISTANT: Sure, I am here to help you in booking. Can you please share your travel dates?

USER: My travelling dates are Aug 16 to Aug 18.

ASSISTANT: Ok, please share your name.

USER: Daniel Thompson here.

ASSISTANT: Let me know your connection limit.

USER: I need a direct flight.

ASSISTANT: Sorry, no flights are available on your preferable travel dates.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for reaching us, have a nice day.