You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you today?

USER: I want to change my reservation, because I have another important work on that dates, can you please help me?

ASSISTANT: Sure, on which name the previous reservation is done.

USER: Sure, my name is Joseph Clark.

ASSISTANT: Sorry for the inconvenience no reservation found based on your name.

USER: It's ok no problem. Thank you for your information.

ASSISTANT: Thank you for reaching us. Have a nice day.