You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you?

USER: Owing for an emergency, I want to change my reservation. Can you please help me?

ASSISTANT: May I know your name please?

USER: My name is Timothy Anderson.

ASSISTANT: Sorry to say, there is no reservation on your name in our database.

USER: Sad to hear that. Anyway, thank you for checking.

ASSISTANT: Thank you for opting us.