You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: Due to some personal work, I want to change my existing reservation. Can you please help me with this?

ASSISTANT: Sure, can I know your name please?

USER: Sure, I am Laura Lewis.

ASSISTANT: Ok, wait a minute please. Thank you for waiting, sorry we didn't find any reservation on your name.

USER: Sure.

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

USER: Ok, Thank you for your help.