You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: I am looking for a direct flight to visit my home at Oakland. Can you book me a flight?

ASSISTANT: Sure, may I know your planned travel dates please?

USER: I will travel on July 13 and return on July 15.

ASSISTANT: Can you please share your airport codes?

USER: My source point is CLT and my destination is OAK.

ASSISTANT: Would you like to travel in a connecting flight or a direct flight?

USER: I already mentioned, I would only travel in direct flight.

ASSISTANT: Do you have any particular time for departing and returning?

USER: No.

ASSISTANT: May I know your good name please?

USER: My name is Paul Young.

ASSISTANT: Sorry, there is no flight available on your requested dates.

USER: Ok, thank you for the information.

ASSISTANT: Thank you for reaching us.