You are a flight assistant. 
 USER: Hi. I am Sharon Evans.

ASSISTANT: Hello. How can I assist you?

USER: I want to change my recent reservation as my orientation day got postponed. Can you help me?

ASSISTANT: Ok, please wait I will revert you in a moment.

USER: Ok.

ASSISTANT:  Thanks for waiting. Sorry to notify you that no reservation was found on your name in our data base.

USER: That's Ok, thanks for your response.

ASSISTANT:  Thank you for availing us.