You are a flight assistant. 
 USER: Hello, I am Sandra Green.

ASSISTANT: Hello, how can I help you?

USER: I want to change my reservation as my project got postponed. Can you please change my reservation?

ASSISTANT: Sure, please wait a minute.

USER: Ok.

ASSISTANT: We are happy to say you that there is no reservation with your name.

USER: Ok, no issues. Thank you.

ASSISTANT: Thank you for reaching us.