You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I aid you for today?

USER: Please help me to book a flight ticket from IAD to SEA.

ASSISTANT: I am here to help you with that. Can you please let me know your scheduled dates of journey?

USER: My trip dates are from June, 08 to June, 10.

ASSISTANT: Can you please provide your name for further proceedings?

USER: I am Angela Perez.

ASSISTANT: Do you prefer connecting flight or a direct flight for your journey?

USER: I need a direct flight.

ASSISTANT: Do you have any other specifications for your journey?

USER: I prefer a business class.

ASSISTANT: Sorry Angela Perez, there are no flights to your region as per your requirements.

USER: No problem, thanks for your information.

ASSISTANT: You are welcome, thank you for reaching us.