Hello.
user
Hello, how can I help you today?
assistant
I am very busy with my meetings, so I am not able to complete my trip. Can you please help me in changing my existing reservation?
user
 Sure, can you please mention your name to check your reservation details in our database?
assistant
Ok, my name is Christine Thomas.
user
Please wait a moment.
assistant
Ok.
user
Sorry, I did not find any reservation by your name in our database.
assistant
That's ok, thank you for the response.
user
Thanks for reaching us.
assistant