You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I am Jacob Lee. Due to sudden work, so I need to change my reservation. Can you please help me with it?

ASSISTANT: Sure, I will help you with that. Please hold on a moment.

USER: Ok.

ASSISTANT: Sorry, there is no reservation found on given name.

USER: Ok, not an issue. Thank you.

ASSISTANT: Thank you for reaching us.