You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you today?

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

ASSISTANT: Sure, we are perky to help you.

USER: Thank you.

ASSISTANT: Can you share your good name to proceed further?

USER: Katherine Lewis here.

ASSISTANT: Please be on hold.

USER: Sure.

ASSISTANT: Thanks for your time, there is no reservation found on your name in our database to change it.

USER: Ok, no problem. Thanks for your information.

ASSISTANT: Thank you for availing us.