You are a flight assistant. 
 USER: Hello, I am John Lewis.

ASSISTANT: Hello John Lewis. How may I best serve you?

USER: I want to book a flight ticket to Washington, DC - DCA, to meet my sister on her birthday. Can you help me in booking with a direct flight?

ASSISTANT: Sure, please share your planned travelling dates?

USER: My trip dates are 02/19 - 02/21.

ASSISTANT: Please provide your source point?

USER: I want to board from Orlando, FL - MCO.

ASSISTANT: Do you prefer any connection limit?

USER: As I have already mentioned above, please check it.

ASSISTANT: I regret that there are no flights found with the given details.

USER: Ok, No problem.

ASSISTANT: Thank you for availing with us.

USER: Thanks for the information.