You are a flight assistant. 
 USER: Hello, I am Laura Miller.

ASSISTANT: Hello, how may I assist you today?

USER: My exams got postponed to another day, so I want change my reservation. Can you pleas help me?

ASSISTANT: Sure, I will help you in changing your existing reservation. Please wait for a minute.

USER: Ok.

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

USER: Ok, not a problem. Thank you for your quick response.

ASSISTANT: Thank you for reaching us, have a good day.