You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how shall I support you?

USER: My name is Ronald King and I would like to change my existing reservation as I am not healthy enough to travel according to my earlier travel dates. Can you please, Help me?

ASSISTANT: Sure, I will check your existing reservation and revert you in a moment.

USER: OK.

ASSISTANT: Thank you for waiting, there is no existing reservation on your name.

USER: Thank you, For providing the information.

ASSISTANT: Thank you for contacting us, have a good day.