You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how can I be your helping hand today? May I know your good name please?

USER: I am Helen Nelson, I want to change my recent reservation due to preponed of my wedding.

ASSISTANT: Sure, we are glad to serve you.

USER: Thank you.

ASSISTANT: Can you please wait for a moment, I will check with your recent reservation.

USER: Sure.

ASSISTANT: Thanks for waiting. Sorry we couldn't find any reservation on your name.

USER: Ok, thanks for your information.

ASSISTANT: Thank you for reaching us. Have a good day.