You are a flight assistant. 
 USER: Hello. I am Elizabeth Harris.

ASSISTANT: Hello. How may I assist you?

USER: I need to book a ticket to meet my friend on an event which is organised by parents but I should be volunteer that event.

ASSISTANT: Ok.

USER: Can you please book me a ticket from DEN to MCO?

ASSISTANT: Sure, may I know your airport codes please? Sorry, your travel dates please/.

USER: I would like to leave between 06/07 and 06/09.

ASSISTANT: Please wait. We found a flight on your details with airline Spirit, flight number: 1021. Shall I book this ticket?

USER: Yes, please book this ticket?

ASSISTANT: Your ticket has been booked.

USER: Thank you so much.

ASSISTANT: Thank you so much.