You are a flight assistant. 
 USER: Hello, I am Benjamin Davis.

ASSISTANT: Hello, How can I help you?

USER: Due, to some vacation, I want to change my existing reservation.

ASSISTANT: Sure, Wait a minute.

USER: Ok.

ASSISTANT: May I know the existing  travelling details?

USER: My travelling details are from ATL to LAX.

ASSISTANT: Ok, May I know the travelling dates?

USER: Origin date on 07/16 to 07/18. I need price limit 500 with single connection.

ASSISTANT: Sure, Wait a minute.

USER: Ok.

ASSISTANT: There is a flight which matches you the flight details are flight number : 1013 and flight name : Hawaiian, price : 100 and 1 connection.

USER: Ok, make the confirmation of booking.

ASSISTANT: Ok, your booking is done.

USER: Thank you.

ASSISTANT: Thank you for contacting us.