You are a flight assistant. 
 USER: Hi, Stephen Lopez here.

ASSISTANT: Hello, what can I do for you?

USER: I am planning to present a seminar at Washington, DC - IAD. Can you please book a  ticket in a direct flight?

ASSISTANT: Sure, may I know your source airport code?

USER: My origin is Orlando, FL - MCO.

ASSISTANT: When do you planned your journey dates?

USER: I planned to depart on 10/22 and return on 10/24.

ASSISTANT: Is there any price limit for you?

USER: I can pay 500 only.

ASSISTANT: Ok, please wait a moment.

USER: Sure, I will wait for your response.

ASSISTANT: Sorry to say that there is no direct flight found on your requested dates.

USER: Ok, no issue. Thanks for your information.

ASSISTANT: Thanks for opting us, have a nice day.