You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I guide you at this moment?

USER: I want to book a ticket from Seattle to Detroit.

ASSISTANT: Sure, may I know your travelling dates for your journey?

USER: Travelling dates are from Apr, 8 to Apr, 10.

ASSISTANT: Let me know your limit on number of connections.

USER: I prefer connecting flight.

ASSISTANT: Do you have any class preference for your journey?

USER: I would like to prefer business class.

ASSISTANT: May I know your airline preference?

USER: I prefer to fly in a normal-cost airline.

ASSISTANT: Can I know your name to proceed further for documentation purpose?

USER: I am Angela Thompson.

ASSISTANT: Ok, please wait for a moment.

USER: Sure.

ASSISTANT: Sorry to say that, there are no flights available as per your specifications.

USER: Thank you.

ASSISTANT: Thank you for reaching us.