You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I aid you?

USER: I prefer to travel in major airlines. So, can you please help me in booking flight ticket under normal cost?

ASSISTANT: May I know on which dates you are willing to travel?

USER: My travelling dates are Mar 22 and Mar 24.

ASSISTANT: Do you require any stopovers in your journey?

USER: Yes, I need a connecting flight.

ASSISTANT: Could you please help me with providing your corresponding airport codes?

USER: My airport codes are DCA and AUS.

ASSISTANT: Do you have any other requirements?

USER: I want to return in the afternoon.

ASSISTANT: Sorry to inform you that unfortunately there is no flights available by the given details.

USER: That's ok, thank you for the response.

ASSISTANT: May I know your name?

USER: My name is Scott Thomas.

ASSISTANT: Thank you.