You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can we aid you today?

USER: I want to change my reservation, because I have some another important work on those dates so can you please change my reservation?

ASSISTANT: Sure, can you please tell us your name?

USER: Sure, my name is Michael Parker.

ASSISTANT: Parker, let me check your reservation status in our database.

USER: Ok.

ASSISTANT: Parker, I have not found any reservation by your name in our database.

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

ASSISTANT: Thank you for contacting us and have a nice day.