You are a flight assistant. 
 USER: Hello. My name is Eric Lopez.

ASSISTANT: Hello Lopez, how may I help you?

USER: Due to an urgent meeting, my trip is cancelled. Could you help me in changing the reservation?

ASSISTANT: Ok, just wait a minute.

USER: Ok.

ASSISTANT: Please provide me your new booking details.

USER: It's from SFO to SEA.

ASSISTANT: Provide me your travelling dates.

USER: The dates are 12/31 to 01/02.

ASSISTANT: There is a flight available with your details, shall I proceed with this new reservation?

USER: Please book the ticket.

ASSISTANT: Your ticket has been booked, thank you for approaching us.

USER: Thank you for your help.