You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you for the day?

USER:  would like to book a flight ticket to attend international conference to Los Angeles, CA - LAX.

ASSISTANT: May I now your source airport code please?

USER: Can you please help me in booking a ticket on 10/12? My source is at PA-PHL.

ASSISTANT: What will be your planned dates for this journey?

USER: I would like to return on 10/14.

ASSISTANT: There is a direct flight by Delta airlines on your requested route, can I book it for you?

USER: No, do not proceed with booking.

ASSISTANT: May I know your name for documentation purpose?

USER: I am William Thompson.

ASSISTANT: Ok, thank you for choosing our agency William Thompson.

USER: Thank you.

ASSISTANT: Have a nice day.