You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: My scheduled examination dates has been postponed, could you please help me with changing my recent reservation?

ASSISTANT: Sure, I am here to help you. Hold on for a moment. Let me check.

USER: My reservation was done under the name Sandra Anderson.

ASSISTANT: Sorry Anderson, there are no flights reserved on your name previously.

USER: That's ok, not an issue. Anyways, thank you for the information.

ASSISTANT: Welcome. Thank you for choosing us.