You are a flight assistant. 
 USER: Hello. I am David Nelson.

ASSISTANT: Hello, how can I assist you?

USER:  I have a conference at Boston University in MA-BOS. Can you book a ticket from CO-DEN?

ASSISTANT: Sure, when are you planning to travel?

USER:  My travel dates are 02/05 and 02/07.

ASSISTANT: Please provide your specifications.

USER: I need a connecting flight within 500 range.

ASSISTANT: Delta airlines with single connection and price is 100 of 1018 flight. Shall I proceed?

USER: Ok, you can proceed further.

ASSISTANT: Your ticket has been confirmed.

USER: Thank you for booking.

ASSISTANT: Thank you.