You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

USER: I am looking for a flight from DCA to LAX, can you help me in booking?

ASSISTANT: Sure, will you mention your travelling dates please?

USER: Sure, my planned travel dates are Mar 14 and Mar 16.

ASSISTANT: Do you have any preferences about flight connections?

USER: Please look for a connecting flight.

ASSISTANT: Do you have any preferences about class?

USER: I prefer for a normal-cost airlines.

ASSISTANT: Please mention your name.

USER: Myself Paul Davis.

ASSISTANT: There are no flights found under your preferable details.

USER: That's ok, no problem. Thank you for the information.

ASSISTANT: Welcome, have a great day.