You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you today?

USER: Can you help me in booking a flight ticket from BOS to DCA?

ASSISTANT: Sure, can you help me with your planned travel dates?

USER: I want to travel on 08/20, and return on 08/22.

ASSISTANT: Ok, would you like to have any lay off in your journey?

USER: Yes, I need a lay by.

ASSISTANT: May I know your class preference?

USER: I am comfortable with any class.

ASSISTANT: Do you have any other requirements for your journey?

USER: I prefer for normal cost airline.

ASSISTANT: Ok, let me know your name to proceed further?

USER: I am Sandra Wright.

ASSISTANT: Sorry, no flights found with your requirements.

USER: Ok, no problem. Thanks for the information.

ASSISTANT: Thank you for contacting us.