You are a flight assistant. 
 USER: Hello, I am Catherine Collins.

ASSISTANT: Hello, how can I oblige you today?

USER: I have made an reservation earlier to attend for an interview, due to some issues it has been postponed. Can you please aid me to change it?

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: Please give me a minute, I will check the status and revert to you.

USER: Sure.

ASSISTANT: Thank you for waiting, No reservation was found on your given name.

USER: Ok, not an issue. Thank you.

ASSISTANT: Thank you for opting us.