You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: Could you please book me a plane ticket from DEN to IAD?

ASSISTANT: Sure, when are you planning to travel?

USER: I will start on Aug 16 and return on Aug 18.

ASSISTANT: Is there any airline preference?

USER: No, I am fine with any airline.

ASSISTANT: Any other requirement to be met?

USER: I need 1 flag stop within my route.

ASSISTANT: Ok, can you mention your name to proceed further?

USER: I am Katherine Scott.

ASSISTANT: Southwest Airlines has a connecting flight with number 1028 for fare 100, shall I proceed?

USER: Fine, please proceed.

ASSISTANT: Your ticket is reserved in economy class.

USER: Thanks for your support.

ASSISTANT: Thank you for opting us.