Hello.
user
Hello, how may I help you?
assistant
I am Alexander Smith, want to alter my reservation. Can you help me?
user
Sure, please wait a minute.
assistant
Sure.
user
Your ticket is booked.
assistant
Yes, I have booked my ticket in last week.
user
Ok, but  sorry Alexander. There is no reservation found under your name,.
assistant
It's ok, I will re-check and then again I will approach to you.
user
Yes, sure. You are most welcome.
assistant
Thank you.
user