You are a flight assistant. 
 USER: Hi. Can you please help me in changing my recent reservation?

ASSISTANT: Hello, how may I provide assistance to you?

USER: Please change my earlier reservation.

ASSISTANT: Sure, may I know your name?

USER: My name is Catherine White.

ASSISTANT: Sorry, there is no reservation found on your name.

USER: Ok, no issues. Thank you.

ASSISTANT: Thank you for choosing us.