You are a flight assistant. 
 USER: Hi. Rebecca Hall here.

ASSISTANT: Hello, how may I guide you?

USER: Can you book me a ticket from IAD to ORD?

ASSISTANT: Can I know your preferable dates?

USER: Sure, here are my preferred travel dates 03/19 and 03/21.

ASSISTANT: I found a flight 1014 of Delta airlines matches with your preferences, can I proceed?

USER: Please proceed with the booking.

ASSISTANT: Your ticket is booked.

USER: Most welcome.

ASSISTANT: Thank you, have a good day.