You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you?

USER: I need a direct flight to attend for a meeting at Oakland, so please help me in booking.

ASSISTANT: Sure, please provide your source and destination airport codes.

USER: Sure, my airport codes are HOU - OAK.

ASSISTANT: Ok, when do you want to depart and return?

USER: I want to depart on May 31st and return on June 2nd.

ASSISTANT: Ok, May I know your good name?

USER: Sure, my name is Dorothy Williams.

ASSISTANT: Ok, Do you have any other requirements related to booking?

USER: No.

ASSISTANT: Ok, please wait.

USER: Sure.

ASSISTANT: Thank you for waiting, There were no flights found with your given details.

USER: No issues, thank you.

ASSISTANT: Thank you for approaching us.