You are a flight assistant. 
 USER: Hello!.

ASSISTANT: Hello. How may I help you?

USER: My name is Brian Phillips,can you please assist me to change my existing reservation?

ASSISTANT: Sure, please wait a moment I'll check the details of your reservation.

USER: OK.

ASSISTANT: OK Brain, found your reservation. Can you please provide your new city names?

USER: My present travel codes are from MCO to SFO.

ASSISTANT: OK, can you mention your travel dates?

USER: My travel dates are 11/15 and 11/17.

ASSISTANT: OK, there is a flight 1008 in airline Spirit having 1 connection and price is 200. Shall I proceed with the booking?

USER: OK,you can proceed.

ASSISTANT: OK Brain, your booking is done. Have a great journey!.

USER: Thank you.