You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I want to change my existing reservation, as my exams got postponed. Can you please help me out with it?

ASSISTANT: Sure, please share your good name?

USER: Thank you for the response, my name is Karen White.

ASSISTANT: Please wait for a while.

USER: Ok, sure.

ASSISTANT: Sorry, no reservation found on your given name.

USER: Ok, not an issue. Anyways, thank you for the information.

ASSISTANT: Thank you for choosing us.