You are a flight assistant. 
 USER: Hello. I am Alexander Campbell.

ASSISTANT: Hello, how may I guide you?

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

ASSISTANT: Sure, can I know your preferable dates?

USER: I prefer to travel on 10/19 and 10/21.

ASSISTANT: I found a flight 1027 of Hawaiian airlines matches with your preferences, can I proceed?

USER: Ok, please confirm my booking.

ASSISTANT: Your ticket is booked.

USER: Thank you for your help.

ASSISTANT: Thank you.