You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you now?

USER: As my sister's engagement has been relocated to Austin. Can you please change reservation with name Dorothy Hernandez?

ASSISTANT: Sure, that's what I am here. Please wait a moment, I will check the reservation list and revert to you.

USER: Ok.

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

USER: Not an issue. Thanks for your information.

ASSISTANT: Thanks for choosing us and have a nice day.