You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, may I know your good name please?

USER: I am Barbara Jones.

ASSISTANT: How can I assist you today?

USER: I need to change my existing reservation due to owing an announcement one of my friend met with an accident.

ASSISTANT: Thanks for giving your details, there is no reservation on your name.

USER: Not an issue. Thanks for your kind response.

ASSISTANT: Thank you choosing us. Have a nice day.