You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you for this moment?

USER: I am Benjamin Carter. I am planning to change my recent reservation, can you please help me out?

ASSISTANT: Sure Carter, I am here to help you.

USER: Thank you.

ASSISTANT: Please wait for a mean while.

USER: Sure, I will wait.

ASSISTANT: Sorry Carter, there is no reservation found as per your name to change your reservation.

USER: That's fine. Thank you for your help.

ASSISTANT: You are welcome always.