You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you today?

USER: Can you please change my reservation?

ASSISTANT: Sure, I am here to help you. May I know your name please?

USER: Angela Parker here.

ASSISTANT: Ok, please wait for a mean while.

USER: Sure, take your time.

ASSISTANT: Sorry Parker, there is no active reservation found on your name to change it in your database.

USER: That's ok, thank you for checking.

ASSISTANT: You are welcome.