You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, How can I serve you?

USER: Can you please help me in booking a flight with a fare of 5000 to reach PHL?

ASSISTANT: Sure, May I know the source code?

USER: My boarding airport code is DCA.

ASSISTANT: Please help me with your travel dates.

USER: My travelling dates are on Feb 20 to Feb 22.

ASSISTANT: Please wait a minute.

USER: Sure.

ASSISTANT: May I know your name?

USER: Sure, my name is Nicholas Rodriguez.

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

USER: No worries, thank you.

ASSISTANT: Thank you for opting us.