You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

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

ASSISTANT: Sure, I will help you. May I know your name?

USER: Linda Johnson here.

ASSISTANT: I am sorry to say that there is no reservation on your name.

USER: No issue, Thanks for the information.

ASSISTANT: Thank you.