You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I aid you today?

USER: I would like to meet my sister on her birthday, can you please help me to book my flight ticket from OAK to ORD?

ASSISTANT: Sure, when are you willing to travel?

USER: Thank you. I have to depart on Sept 5th and return back on Sept 7th.

ASSISTANT: May I know your good name please?

USER: Sure, my name is Jessica Hernandez.

ASSISTANT: Do you have any specifications to be met?

USER: Yes, I need direct flight.

ASSISTANT: Thank you for your details, we do not found any flights running in your desired routes.

USER: No problem, thank you for checking.

ASSISTANT: Thank you for reaching us.