You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you?

USER: I am Patricia Robinson I want to change an existing reservation due to my internship got preponed.

ASSISTANT: OK, please wait I will let you know.

USER: Ok.

ASSISTANT: Sorry, no reservation found on your name.

USER: No issue.

ASSISTANT: Thank you for availing us.

USER: Thank you for your response.