You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I serve you?

USER: I want to change my existing reservation due to my exams got postponed. Can you help me out?

ASSISTANT: Sure, can I have your name to track your details?

USER: My name is Linda Evans.

ASSISTANT: Ok, wait a moment.

USER: Sure.

ASSISTANT: Sorry for the inconvenience, there is no reservation exist on the name Linda Evans.

USER: Ok, No problem. Thank you.

ASSISTANT: Thank you for consulting us.