Hello.
user
Hello.
assistant
Owning business trip in San Francisco, can you book a flight ticket for me?
user
Can u provide your travel dates?
assistant
Actually, my business trip first is in US, so that has been changed to San Francisco. Could you change an existing reservation to  new one.
user
May I know your name?
assistant
Myself Kenneth Mitchell.
user
Kenneth, please provide your airport codes?
assistant
My location codes are SFO and MCO.
user
Sorry, there is no reservation by your name.
assistant
Ok, thank you for service.
user
Thank you for contacting us.
assistant