You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I would like to book a ticket to Seattle as I am moving for business meet, can you please help me out?

ASSISTANT: Sure, may I know your airport codes please?

USER: I am flying from DEN to SEA. My travelling departure and arrival dates are 04/21 and 04/23.

ASSISTANT: Ok, please wait for a moment.

USER: Sure.

ASSISTANT: Thanks for waiting. I have found Delta airlines which flies with one connection.

USER: Ok, you can proceed with this flight.

ASSISTANT: Your flight ticket has been confirmed now.

USER: Thank you for your services.

ASSISTANT: Thank you.