You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: I want to attend a Seminar in Philadelphia. Can you please help me for booking the flight ticket?

ASSISTANT: Sure, I am here to help you. Can I know your travel dates?

USER: My travelling dates are Aug 12 and Aug 14.

ASSISTANT: Ok, what are your origin and destination airport codes?

USER: My airport codes are EWR and PHL.

ASSISTANT: Ok, please tell me your connection limit preference.

USER: I prefer single connecting flight.

ASSISTANT: Ok, do you have any other preference?

USER: I want to return in afternoon.

ASSISTANT: Ok, may I know your name please?

USER: My name is Jonathan Gonzalez.

ASSISTANT: Sorry to inform you, there is no flight found with the details you have provided.

USER: Anyway, thanks for the information.

ASSISTANT: You are welcome. Thank you for approaching us.