You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you today?

USER: I am Richard Robinson, want to alter my recent reservation due to some personal issues. Please help me out with that.

ASSISTANT: Sure, I am gleeful to help you to change your reservation.

USER: Thank you.

ASSISTANT: Please wait a moment.

USER: Sure.

ASSISTANT: Sorry, I didn't find any reservation on your name in our database to change your reservation.

USER: It's ok, thank you for your help.

ASSISTANT: Thank you for reaching us, have a nice day.

USER: Thank you.