You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I aid you today?

USER: Will you please book me a flight ticket from DEN to IAD?

ASSISTANT: Sure, I will help you with that. Can you please share your preferable journey dates?

USER: I am planning to start on Dec 13 and return on Dec 15.

ASSISTANT: May I know your name please?

USER: I am Angela Baker.

ASSISTANT: Do you have any connection limit?

USER: I need 1 stop over within my route.

ASSISTANT: Is there any other specifications?

USER: Yes, I need a business class flight.

ASSISTANT: I am sorry to say that there is no flight found under your details.

USER: That's alright, thanks for your assistance.

ASSISTANT: Thank you for reaching us.