You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Kevin Thomas.

ASSISTANT: Kevin, how can I aid you today?

USER: I would like to visit Chicago to meet my friend, can you please book me a ticket from DEN to ORD?

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: May I know your travel dates please?

USER: I want to depart on Sept 12 and would like to return on Sept 14.

ASSISTANT: Ok, hold on for a moment. Let me check the best flight for you.

USER: Sure, I will wait for your response.

ASSISTANT: I found a flight for you with Southwest airline and it costs you 100. Shall I proceed?

USER: Please book my ticket with this airlines.

ASSISTANT: Your ticket has been booked with 1007 flight number.

USER: Thank you for booking my ticket.

ASSISTANT: Welcome, thank you for choosing us. Have a safe flight.