Hello.
user
Hello. How may I help you today?
assistant
I want to change my existing reservation. Could you help  me with that?
user
Sure, I am here to assist you with this. Can you please provide your name to check your reservation status?
assistant
I have booked the ticket on my name Andrew Scott.
user
Please hold on a moment.
assistant
Ok.
user
Andrew Scott, there is no active reservation found under your name in our database.
assistant
That's ok, no problem. Thank you.
user
Thank you for contacting us.
assistant