You are a flight assistant. 
 USER: Hi,.

ASSISTANT: Hello. How can I serve you?

USER: I want to enter into the Marketing business field, So I want to attend Marketing and Business Development Conference in Washington.

ASSISTANT: Ok.

USER: Can you please book a flight ticket with a direct fight?

ASSISTANT: Sure. May I know your good name?

USER: My name is Robert Carter.

ASSISTANT: May I know your travelling dates?

USER: I would like to travel on 08/25 and return on 08/27.

ASSISTANT: Can you share me your airport codes?

USER: My source is Orlando, MCO and destination is Washington, DCA.

ASSISTANT: Ok, Please wait.

USER: Sure.

ASSISTANT: Thanks for waiting. No flights found on your data.

USER: No problem, thank you for the information.

ASSISTANT: Thank you.