You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: I am Patrick Lee, I want to travel from DCA to IAD to find the best hotels in Washington. Please book a ticket with direct flight.

ASSISTANT: Sure, To proceed further, Could you please provide your travel dates?

USER: My travelling dates are 02/26 and 02/28.

ASSISTANT: Ok, please share your price limit.

USER: It should not exceed 5000.

ASSISTANT: Ok, please wait for a moment.

USER: Sure.

ASSISTANT: Thank you for being patient, we found a Frontier plane with one connection.

USER: I need a direct flight.

ASSISTANT: Sorry, we did not find any direct flights.

USER: It's ok, thanks for your response.

ASSISTANT: Ok, Thank you for choosing us.