You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I help you?

USER: I need to change my reservation as my meeting got postponed, can you please help me?

ASSISTANT: Yes, I can help you.

USER: Thank you.

ASSISTANT: Can you tell me your name for checking?

USER: I am Sandra Anderson.

ASSISTANT: Give me a moment.

USER: Ok.

ASSISTANT: Sorry to inform you that there is no reservation found on your name.

USER: Ok, no problem. Thank you for the information.

ASSISTANT: Thank you for reaching us.