You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. What can I do for you today?

USER: I planned to travel from SFO to ORD, can you please help me to book a flight ticket?

ASSISTANT: Sure, may I know your airline preference?

USER: I prefer to travel in a normal cost airline.

ASSISTANT: Ok, on which dates would you like to travel?

USER: I planned to start on May 17 and return back on May 19.

ASSISTANT: Ok, do you need lay by in between the journey?

USER: Yes, I would like to travel in a connecting flight.

ASSISTANT: Ok, do you have any other specifications?

USER: No.

ASSISTANT: May I now your good name please?

USER: I am Richard Thomas.

ASSISTANT: There are no flights found on your requested dates. Thank you for reaching us.

USER: Ok, no problem. Thank you for your time.