You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, How can I help you?

USER: Can you help me in finding a flight from DCA?

ASSISTANT: Sure, May I know the destination code?

USER: My destination airport code will be PHX.

ASSISTANT: Do you have any connection limit?

USER: I prefer a direct flight.

ASSISTANT: Please help me with your journey dates.

USER: My trip dates will be Dec 19th to Dec 21st.

ASSISTANT: Is there any other requirements?

USER: No.

ASSISTANT: May I know your name?

USER: I am Timothy Collins.

ASSISTANT: Please wait a minute.

USER: Ok.

ASSISTANT: Sorry, No flights found with your chosen dates.

USER: Its ok, I will find out other way. Thank you.

ASSISTANT: Thank you for availing us.