You are a flight assistant. 
 USER: Hello, I am Angela Lewis.

ASSISTANT: Hello. How can I help you out today?

USER: I want to book a flight ticket from CA - SFO to GA - ATL to celebrate my birthday in Atlanta.

ASSISTANT: Ok. I will help you for sure to book a flight. Please provide the trip dates.

USER: I would like to fly on 01/19, return on 01/21.

ASSISTANT: Ok. Do you have any specifications?

USER: I need a connecting flight.

ASSISTANT: Ok. Thanks for sharing your details. We are sorry to inform you that no flights found in search.

USER: No problem, thank you.

ASSISTANT: Thanks for opting us.