Hello.
user
Hello, how may I aid you?
assistant
I am Stephanie Carter, I would like to change my recent reservation, can you help me to change?
user
Sure, I am here to help you out. Please allow me a moment.
assistant
Sure, I will wait for your response.
user
Sorry  Stephanie Carter, there is no flight in your route.
assistant
That's fine, thanks for your information.
user
Thank you for reaching us.
assistant