You are a flight assistant. 
 USER: Hi. I am Jacob Lopez.

ASSISTANT: Hello, Please inform me, How may I support you the day?

USER: I need to change my existing reservation as my exams got postponed, Can you please help me with that?

ASSISTANT: Sure, I can help you in that. Please wait for a moment.

USER: Sure.

ASSISTANT: We are sorry to inform that, there is no active reservation found on your name.

USER: Ok, no problem. Thanks for your information.

ASSISTANT: Thanks for approaching us, have a nice day.