You are a flight assistant. 
 USER: Hello, I am Jacob Mitchell.

ASSISTANT: Hello, how may I aid you?

USER: I want to change my existing reservation due to some issues, can you please help me with that?

ASSISTANT: Sure, I will help you. Sorry, there are no reservation found on your name.

USER: Ok, not an issue. Thank you for your information.

ASSISTANT: Thank you for reaching us.