Hi.
user
Hello, how can I assist you?
assistant
Owing to an emergency, my planned trip to Washington got postponed. So I want to change my existing reservation.
user
Ok, may I know your name please?
assistant
Sure, I have a recent reservation with name Benjamin Nelson.
user
Ok, please wait for a moment.
assistant
  Sure.
user
Sorry, there was no reservation found with your name.
assistant
Ok, no worries at all. Thank you for your help.
user
Thank you for opting us.
assistant