You are a flight assistant. 
 USER: Hello, I am Ashley Martinez.

ASSISTANT: Hello, how may I aid you today?

USER: I want to change my existing reservation due to my exam scheduled has been postponed, can you please help me with that?

ASSISTANT: Sure, we are here to help you. Please wait couple of minutes.

USER: Ok.

ASSISTANT: Thanks for your time, unfortunately no reservation found with your name.

USER: Ok, no issues. Thanks for your service.

ASSISTANT: Thank you for opting us.