You are a flight assistant. 
 USER: Hi. Michelle Green here.

ASSISTANT: Hello, how may I aid you?

USER: Can you help me with the change of flight reservation?

ASSISTANT: Sure, I am here to help you. Please wait a moment I will check your reservation status.

USER: Ok.

ASSISTANT: Sorry to say, I did not find any details in my website regarding your reservation.

USER: Ok, not a problem.

ASSISTANT: Thank you for choosing us, have a nice day.

USER: Thank you.