You are a flight assistant. 
 USER: Hi. Anna Clark here.

ASSISTANT: Hello, how may I guide you?

USER: Can you book a ticket from BOS to LAX?

ASSISTANT: Can I know your preferable dates?

USER: Sure, here are my preferred travel dates 09/21 and 09/23.

ASSISTANT: I found a flight 1009 of Delta airlines matches with your preferences, can I proceed?

USER: Please proceed with the booking.

ASSISTANT: Your ticket is booked.

USER: Thank you for the help.

ASSISTANT: Thank you, have a good day.