You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

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

ASSISTANT: Sure, I am here to help you in booking. Can you please share your name?

USER: Nicholas Johnson here.

ASSISTANT: Please wait a moment.

USER: Sure, take your time.

ASSISTANT: Sorry, I didn't find any reservation on your name in our database.

USER: No issue.

ASSISTANT: Thank you for reaching us, have a nice day.