You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you today?

USER: Could you book my ticket in a direct flight?

ASSISTANT: Sure, can I know your good name?

USER: Jacob Young here.

ASSISTANT: When do you want to travel?

USER: My itinerary dates are Sept 12 and 14.

ASSISTANT: May I know your specific airport codes please?

USER: My genesis and terminus airport codes are OAK and PHX.

ASSISTANT: Please share your other specifications if you have.

USER: I want to return from PHX in the afternoon.

ASSISTANT: Sorry to say that, there are no flights available on the routes of your journey.

USER: No problem, thank you.

ASSISTANT: Thank you for contacting us.