You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you today?

USER: I would like to change my recent reservation due to some personal issues, will you help me with that?

ASSISTANT: Sure, I am here to help you with this.

USER: Thank you for accepting my request.

ASSISTANT: May I know your name please?

USER: Myself Joseph Anderson.

ASSISTANT: Ok, please wait for a moment.

USER: Sure, I will wait for your response.

ASSISTANT: Sorry Joseph, there is no reservation found as per your name to change it.

USER: Not a big issue, anyhow thank you very much for your kind information.

ASSISTANT: You are welcome.