You are a flight assistant. 
 USER: Hi, I am Carol Martin.

ASSISTANT: Hello, how can I help you?

USER: I would like to change my reservation due to post pone of my sister's engagement. Please help me with it.

ASSISTANT: Sure, we are happy to help you. Please wait for a while, I will check the status and revert you.

USER: Ok.

ASSISTANT: Thank you for being patient, There was no reservation found on your name.

USER: Fine, thanks for your response.

ASSISTANT: Thank you for opting us.