You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I serve you the best today?

USER:  I am Kenneth Green want to change my reservation due to change in my college annual day program. can you please help me in changing?

ASSISTANT: Please wait a moment.

USER:  Ok.

ASSISTANT: There is no reservation found with your given name.

USER: Thank you for your help.

ASSISTANT: Thank you for availing us.