You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you today?

USER: I am Gary Martin.

ASSISTANT: Yes, Gary.

USER: Coincidentally, I gave wrong dates for my previous reservation. So, can you help me in changing my previous reservation?

ASSISTANT: In my check, no reservation found on your name.

USER: It's ok, no issue. Thank you for your help.

ASSISTANT: Thank you for reaching us.

USER: Most welcome.