You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you today?

USER:  I need to change my existing reservation as my exams got postponed, Can you please help me with that?

ASSISTANT: Sure, may I know your good name please?

USER: I am Andrew Scott.

ASSISTANT: Please wait for a moment.

USER: Sure.

ASSISTANT: Sorry Scott, there is no reservation found as per your name in our database.

USER: Ok, no issues. Thanks for the information.

ASSISTANT: Thank you for reaching us with a query.