You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I support you today?

USER: Assist me in changing my previous flight reservation. As my travelling dates are modified.

ASSISTANT: Sure, let me know your name to check further?

USER: Thanks for accepting my request. Jacob White here.

ASSISTANT: Please stand by.

USER: Sure.

ASSISTANT: Sorry, no reservation found on your name in our database to change it.

USER: Ok, not an issue. Thanks for checking.

ASSISTANT: Thank you for contacting us.