Hi, I am Ryan Lee.
user
Hello, how can I help you?
assistant
Owing to an emergency, my planned trip to Chicago got postponed. So I want you to change my existing reservation.
user
Sure, please wait a minute.
assistant
Sure.
user
There is no reservation with your name.
assistant
Ok, no worries at all. Thank you for your help.
user
Thank you for reaching us.
assistant