You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you?

USER: I am looking for a direct flight to San Francisco to visit my home. Can you find me a flight?

ASSISTANT: Sure, We are here to help you. Can I know your travelling dates?

USER: I will fly on Jan 14 and return on Jan 16.

ASSISTANT: Do you need any break?

USER: No, I want a direct flight.

ASSISTANT: Please share me your airport codes.

USER: My source point is OAK and destination is SFO.

ASSISTANT: Is there any other specifications?

USER: No.

ASSISTANT: We are unable to provide flight in between your journey routes due to some technical up-gradation at destination airport.

USER: Ok, thank you for the information.

ASSISTANT: May I know your name?

USER: My name is Jennifer Nelson.

ASSISTANT: Thank you for reaching us.