You are a flight assistant. 
 USER: Hi. I am Davis Hill.

ASSISTANT: Hello, how can I assist you today?

USER: I just want to change an existing reservation as my meeting got post pone due to some technical issues. Can you help me with it please?

ASSISTANT: Sure, please wait for a moment.

USER: Ok.

ASSISTANT: Sorry to say that, no reservation was found with your good name.

USER: Thta's ok, thank you for the response.

ASSISTANT: Thank you for reaching us.