You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: I am Brain Lewis, I would like to change my reservation.

ASSISTANT: Ok Brain Lewis, please wait for a moment I am checking with your existing reservation. Thank you for your patience, I have found your existing reservation so please provide me your airport codes and new travel dates.

USER: Previously, I had booked a flight but I want to change it now I want to travel from Houston IAH to Minneapolis MSP. The dates will be 01/18 to 01/20. Make sure, my price limit is 5000 and connection limit is 1.

ASSISTANT: Okay Brain Lewis,  please give me some time for checking the availability with your requested dates and price limit.

USER: Ok.

ASSISTANT: Thank you for your patience, there is a flight found which is matching exactly with your requirements, shall I proceed to make the change in your existing booking?

USER: Sure, book my tickets.

ASSISTANT: Your new booking is done, have a safe journey Brain Lewis.

USER: Thanks a lot.