You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Mary White.

ASSISTANT: How can I aid you now?

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

ASSISTANT: Sure, may I know your dates of travel please?

USER: I am planning to travel on May 02 and return back on May 04.

ASSISTANT: Do you have any connection limit?

USER: Yes, I am looking for a connecting flight.

ASSISTANT: May I know about your class preference?

USER: My depart and return time should be afternoon.

ASSISTANT: Do you have any other preferences?

USER: No.

ASSISTANT: Sorry, we have not found any flights running on your desired routes.

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

ASSISTANT: Thank you for reaching us.