You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

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

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: May I know your name for checking previous reservation?

USER: John Evans here.

ASSISTANT: There is no reservation found under your name.

USER: No problem, Thanks for the information.

ASSISTANT: Thank you for opting us.