You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you?

USER: Due to inconvenience of my work, I want to change my reservation. Can you please help me for that?

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

USER: Thanks for that.

ASSISTANT: May I know your name to check your previous reservation status?

USER: My name is Jennifer Williams.

ASSISTANT: Ok, please give me a moment.

USER: Ok, I will wait.

ASSISTANT: Sorry, there is no reservation found on your name in our records to modify.

USER: Anyway, thanks for the information.

ASSISTANT: Thank you for reaching us.