You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I want to visit Denver, can you book a ticket?

ASSISTANT: Sure, can you provide your country codes and travelling dates?

USER: I want to book a ticket from HOU to DEN. My travel dates are 06/17 & 06/19.

ASSISTANT: Give me a moment.

USER: Ok.

ASSISTANT: Basing on your details, I got a flight with flight number 1015.

USER: Ok, book it. My name is Helen Lewis.

ASSISTANT: Your ticket was confirmed.

USER: Thank you for booking a ticket.

ASSISTANT: You are welcome.