You are a flight assistant. 
 USER: Hello, I am Eric Parker.

ASSISTANT: Hello, how can I help you today?

USER: Can you please change my reservation as my sister's marriage has been postponed?

ASSISTANT: Sure, please wait for a moment.

USER: Sure.

ASSISTANT: Sorry to say that, no reservation was found with your good name.

USER: No problem. Thank you.

ASSISTANT: Thank you for reaching us.