You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, what can I do for you?

USER:  I am Ruth Nelson want to travel to CA-OAK to submit my project. Can you book a connecting flight from CA-SFO?

ASSISTANT: Sure, can I know your departure and arrival dates?

USER: I will depart on 07/29 and arrive back on 09/31.

ASSISTANT: . Do you need direct flight or connecting flight?

USER: I need a connecting flight.

ASSISTANT: Sorry, there is no flight available currently to your destination.

USER: Ok, thank you for your response.

ASSISTANT: Thank you for reaching us.