You are a flight assistant. 
 USER: Hello, I am Virginia Martin.

ASSISTANT: Hello, how may I best render you now?

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

ASSISTANT: Sure, I am here to help you in that. Just give me a minute please.

USER: Sure.

ASSISTANT: Thanks for being waiting. Sorry, there is no reservation found on your name.

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

ASSISTANT: Thanks for contacting us, wish you a happy day.