Hello.
user
Hello, how may I help you?
assistant
I am Andrew Campbell, I just wanted to change my reservation due to my vacation trip got postponed. Will you please help me with that?
user
Sure, wait for a minute.
assistant
Ok, please take a time.
user
Sorry Campbell, no reservation found on your name.
assistant
Oh! It's ok fine, may be I did a mistake.
user
OK, thank you for approaching  us.
assistant
Thank you for your help.
user