You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you today?

USER: Timothy Johnson here.

ASSISTANT: Nice meeting you Timothy.

USER: By mistake, I gave wrong dates in my previous reservation. Can you please alter my reservation?

ASSISTANT: Sure, please hold on for a while.

USER: Sure, take your time.

ASSISTANT: Sorry Timothy, we did not find any reservation with your name in our records.

USER: It's fine. Thank you for your support.

ASSISTANT: It's my pleasure.