You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: Actually I made a earlier reservation to go for a trip with my friends, but heavy work load in office, so I want to change my reservation. Can you please help me with that?

ASSISTANT: Sure, can I know your name to make necessary changes to the reservation?

USER: Sure, this is Lisa Jackson.

ASSISTANT: Please wait.

USER: Sure.

ASSISTANT: Sorry, no reservation found with your name.

USER: Ok, not an issue. My brother might have changed my reservation. Anyway, thank you.

ASSISTANT: Thank you for reaching us.