You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you today?

USER: I want to book a flight ticket with normal cost airline.Could you please help me with booking a flight ticket?

ASSISTANT: Sure, please submit your airport codes.

USER: My airport codes are DCA and PHX.

ASSISTANT: Ok, assist me with your travel dates.

USER: My travelling dates are May 14 and May 16.

ASSISTANT: Do you have any connection limit preference?

USER: I prefer to travel in a connecting flight.

ASSISTANT: May I know your name please?

USER: I am Stephen Jones. I want to travel in a business class.

ASSISTANT: Sure, please wait a moment.

USER: Sure.

ASSISTANT: Sorry, based on your given specifications we have not found any flight in airline database.

USER: No worries, thank you for the information.

ASSISTANT: Thanks for Reaching us.