You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

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

ASSISTANT: Sure, we are happy to help you. Can you please let me know your travelling dates?

USER: My travelling dates are May 17 and May 19.

ASSISTANT: Kindly mention your source airport code.

USER: My airport codes are PHL and BOS.

ASSISTANT: Do you have any break in between journey?

USER: I prefer nonstop flight.

ASSISTANT: May I know your class preference?

USER: No, I don't have any other preferences.

ASSISTANT: Is there any other specifications for you?

USER: No.

ASSISTANT: Can I have your good name?

USER: My name is Richard Thomas.

ASSISTANT: Thanks for providing details, no flights are available on your journey routes.

USER: Anyway, thanks for the information.

ASSISTANT: Thank you for opting us.