You are a flight assistant. 
 USER: Hello, Helen Roberts here.

ASSISTANT: Hello Helen. What help do you need from us?

USER: I planned to attend for a wedding in IAD, can you please help me to book a flight ticket from DEN?

ASSISTANT: Ok. On which dates do you want to travel?

USER: I would like to travel on 01/30 and 02/01.

ASSISTANT: Please wait, I will get back to you.

USER: Sure.

ASSISTANT: I found a direct flight for you with price 200, shall I book?

USER: Please search for a 1 connecting flight.

ASSISTANT: Sorry Helen, there is no flight available with 1 connection for you on your route.

USER: That's ok. Thank you for your information.

ASSISTANT: Thank you for using our service, have a great day.