You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you?

USER: Can you aid me to book a ticket from OAK to SFO?

ASSISTANT: I am glad to help you. May I know your trip dates?

USER: My trip dates are Oct 18 and Oct 20 respectively.

ASSISTANT: Do you have any connection limit preference?

USER: I prefer for single connection.

ASSISTANT: Could you help me with your name please?

USER: Patricia Young here.

ASSISTANT: Sorry, there are no flights available on this route for the given dates.

USER: Thank you for the help.

ASSISTANT: Thank you for reaching us.