You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how may I render you at this moment?

USER: I am Ronald King. I want to change my reservation as my plan to meet my share holder is postponed. Can you help me with that?

ASSISTANT: Sure, I am here to help you. Please wait for few minutes.

USER: Thank you. Sure.

ASSISTANT: There is no existing reservation found on your name in our data base.

USER: Ok, no issues. Thanks for the information.

ASSISTANT: Thank you for reaching us.