Hello.
user
Hello. How can I help you?
assistant
My name is Charles Garcia. I need your help to book a flight ticket.
user
OK Charles.
assistant
Actually I want to change my existing reservation. Can you please help me with that.
user
OK, please wait so that I can check the details.
assistant
Sure.
user
Yes, I can help you.
assistant
Thank you.
user
Sorry, I did not find any existing reservation on your name.
assistant
OK. Thank you for the information.
user
Thank you for reaching us.
assistant