You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, How can I aid you?

USER: Owing to an emergency I need to change my reservation,could you please help me?

ASSISTANT: Sure, May I know your name?

USER: I am Patrick Wright.

ASSISTANT: Sure, Wait a minute.

USER: Ok.

ASSISTANT:  Sorry to tell that there is no reservation on your name.

USER: Ok,No problem.

ASSISTANT: Thank you for approaching us.

USER: Thank you for your help.