You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you?

USER: I would like to change my reservation, can you please help me?

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: Can I know your name please to proceed further?

USER: My name is Samuel Williams.

ASSISTANT: Please wait for a moment.

USER: Sure, take your own time.

ASSISTANT: Sorry to inform you that there is no active reservation found on your given name.

USER: No issues. Thank you for checking.

ASSISTANT: Thanks for reaching us, have a nice day.