You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: Can you please help me in changing my recent reservation?

ASSISTANT: Sure.

USER: Thank you.

ASSISTANT: May I know your name please?

USER: I am William Baker.

ASSISTANT: Please wait.

USER: Sure.

ASSISTANT: Thanks for your time. Sorry I could not fine your flight reservation to change it.

USER: Its ok, thank you.

ASSISTANT: Thank you.