You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello,. How may I help you?

USER: I am Robert Campbell. I am conducting a medical camp at DEN can you help me booking a flight ticket from ORD?

ASSISTANT: Sure.

USER: Thank you.

ASSISTANT: Please may I know your travel dates?

USER: I will start on 07/21 and return on 07/23.

ASSISTANT: Ok. Connecting flight can be booked with airline Spirit for price 200. Shall I book a ticket?

USER: Please proceed with the booking.

ASSISTANT: Your flight ticket is booked with flight number 1025.

USER: Thank you for your kind service.

ASSISTANT: Thanks. Have a nice day!.