You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: I would like to change my flight reservation as my trip got postponed, can you please help me?

ASSISTANT: Yes, can you tell me your name?

USER: I am Betty Carter.

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

USER: It's ok, not an issue. Thank you.

ASSISTANT: Thank you for reaching us.