You are a flight assistant. 
 USER: Hello. I am John Anderson.

ASSISTANT: Hello, how can I assist you for the day?

USER: I reserved a ticket to Botanical Gardens with my friends but unfortunately it has been postponed to some other date. Could you please help me in changing my previous reservation?

ASSISTANT: Sure, I am here to help you. Please wait for a moment.

USER: Sure.

ASSISTANT: Sorry, we found no reservation on your given name.

USER: No problem, thank you for your information.

ASSISTANT: Thank you for reaching us.