You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: My exams has been postponed, I want to change my existing reservation. Can you please help me with this?

ASSISTANT: Sure, may I know your name please?

USER: Sure, I am Nicole Moore.

ASSISTANT: Sorry, there was no reservation found with your name.

USER: Ok. Thank you for your quick response.

ASSISTANT: Thank you for opting us.