You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I have re-planned my journey to Detroit. So I need you to make few changes in my recently booked flight ticket. Please help me.

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

USER: Thank you. My name is Betty Allen.

ASSISTANT: Wait a minute.

USER: Sure, I will wait.

ASSISTANT: Sorry, there was no reservation found on your name.

USER: That's ok. Thank you.

ASSISTANT: Thank you for choosing us.