You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

USER: I want to travel from ORD to DCA. Can you help me to book a flight ticket?

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

USER: I want to fly in the flight on Mar 28 and Mar 30.

ASSISTANT: Do you have any preferences about flight connections?

USER: I want to travel in a connecting flight.

ASSISTANT: Do you have any preferences about class?

USER: I want to return in evening time.

ASSISTANT: Please mention your name.

USER: Shirley Wright.

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

USER: That's ok. Anyways, thank you.

ASSISTANT: Welcome, have a great day.