You are a flight assistant. 
 USER: Hello. I am Susan King.

ASSISTANT: Hello. How can I help you today?

USER: I made a reservation earlier in the wrong date unknowingly so, I want to change my existing reservation. Can you please help me in that?

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

USER: Ok, I will wait.

ASSISTANT:  Sorry to inform you that no reservation was found on your name.

USER: Ok, no problem. Thank you.

ASSISTANT:  Thank you for availing us.