Hello.
user
Hello, how could I assist you today?
assistant
 I am Charles Rodriguez want to change my reservation owing an emergency. Can you help me in changing?
user
Sure, please wait for a while let me check and get back to you.
assistant
 Ok.
user
Sorry to inform, there is no reservation found with your given name.
assistant
 Thank you for your help.
user
Thank you for reaching us.
assistant