You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you now?

USER: I want to travel from EWR to PHL. Can you help me to book a flight ticket?

ASSISTANT: Sure, I will help you with that. Can you please provide your preferable dates of travelling?

USER: I want to travel in the flight on Apr 20 and Apr 22.

ASSISTANT: May I know your name to book the flight ticket?

USER: George King.

ASSISTANT: Do you have any connection limit?

USER: I want to have a connecting flight.

ASSISTANT: Do you have any more preferences?

USER: I prefer to travel in business class.

ASSISTANT: Please wait a moment to check the flights.

USER: Ok, take your time.

ASSISTANT: We regret to inform you that, there are no flights moving to your region with your requested dates of travelling.

USER: That's ok. Anyways, thank you.

ASSISTANT: Thank you for reaching to our services, hope you have a great day.