Hello.
Hello, how may I assist you?
I need to change my existing reservation, as my planned trip got  with my friend got post-phoned.  Can you please help me out?
Sure, may I know your good name please?
Thank you for considering my request. My name is Michael Williams.
Please wait for a moment.
Sure, I will wait for your response.
Sorry, there is no reservation found on your name in our database to change.
Not an issue, anyway thank you for the information.
Thank you for approaching us.