You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I aid you today?

USER: Can you please help me in booking a flight ticket to DEN from OAK?

ASSISTANT: Sure. Can you please mention your preferable travel dates?

USER: My preferred dates of travel are from Sept 10 to Sept 12.

ASSISTANT: May I know your name for further process?

USER: I am Samantha Hernandez.

ASSISTANT: Are you ok with connecting flight or you need a direct flight?

USER: I am ok with direct flight.

ASSISTANT: Do you have any another specifications?

USER: I need a business class ticket.

ASSISTANT: Do you have any another preferences?

USER: No.

ASSISTANT: Ok, please wait a moment.

USER: Ok.

ASSISTANT: Sorry, no flights are available in this route as per your requested dates.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for reaching us.