You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you at this moment?

USER: Can you aid me to change my reservation due to emergency?

ASSISTANT: Sure, I will help you with that. May I know your name for further process?

USER: Barbara Carter here.

ASSISTANT: There is no previous reservation available under your name.

USER: No issue. Thank you.

ASSISTANT: Thank you for reaching us.