You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello,. How can I assist you?

USER: I am Scott Nelson and I want to change an existing reservation.

ASSISTANT: OK.wait for moment. will check and revert to you.

USER: OK,.

ASSISTANT: Please let me know your journey details ?

USER: Sure, My new reservation departs from Los Angeles,CA-LAX and returns from Houston,TX-HOU. The dates of travelling are  Oct 16  and Oct 18.

ASSISTANT: Thanks for your patience.Flight details are flight number is 1001 and airline name is Hawaiian. And price limit 100 with a connection limit 1.

USER: OK, You can proceed with booking.

ASSISTANT: OK. Your ticket reservation has been changed.

USER: Thank you for your service.

ASSISTANT: Thanks for choosing us.