You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you at this moment?

USER: I am planning to book a ticket from ORD to IAD. Can you please help me out to book a ticket for me?

ASSISTANT: Sure, I am here to help you. Can you please provide your journey dates?

USER: I would like to travel on Mar 06 and return back on Mar 08.

ASSISTANT: Do you have any connection limit preference?

USER: I am looking for a connecting flight.

ASSISTANT: Do you have any class preference?

USER: No, I am ok with any class.

ASSISTANT: Do you have any other specifications for this trip?

USER: My return time should be afternoon.

ASSISTANT: May I know your good name please?

USER: My name is Deborah White.

ASSISTANT: Deborah White, there are no flight services are available on this route on your provided dates.

USER: That's fine, thank you for your service.

ASSISTANT: Thank you for contacting us.