You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I guide you for today?

USER: Can you help me to change my reservation, which was previously reserved that some data details was incorrect.

ASSISTANT: Can you please provide your name to check your existing reservation?

USER:  Previously ticket reserved with the name of Nicholas Nelson.

ASSISTANT: Sorry, there is no reservation found under your name.

USER: It's not a problem. I really appreciated your help.

ASSISTANT: Thank you for reaching us.