You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how may I assist you?

USER: I am Barbara Jones. Owing to an emergency I want change my existing reservation, can you please help me with that?

ASSISTANT: Sure, please wait for a minute.

USER: Ok.

ASSISTANT: Unfortunately there is no reservation found with your name.

USER: Ok, no issues. Thanks for your information.

ASSISTANT: Thank you for choosing our service.