You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: I would like change my recent reservation, could you please help me with that?

ASSISTANT: Sure, may I know your name?

USER: I am John Lopez.

ASSISTANT: Please wait a minute.

USER: Sure, take your time.

ASSISTANT: Sorry, no reservation found on your name.

USER: Ok, no issues. Thank you for checking.

ASSISTANT: Thank you for availing us.