You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I help you?

USER: Can you please help me in booking from DEN to IAD?

ASSISTANT: Sure, can you mention your trip dates?

USER: My travelling dates are from Dec 25 to Dec 27.

ASSISTANT: Do you need any connections?

USER: I need a connecting flight.

ASSISTANT: Are there any other preferences?

USER: No.

ASSISTANT: May I know your name?

USER: My name is Katherine Perez.

ASSISTANT: Connecting flight number 1012 with price 100 in economy class is available. Is it ok?

USER: Ok, proceed.

ASSISTANT: Your ticket is booked.

USER: Thank you.

ASSISTANT: Thank you for reaching us.