You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you today?

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

ASSISTANT: Sure, we are here to help you. May I know your good name please?

USER: Jennifer Johnson here.

ASSISTANT: Sorry to inform you that, there is no reservation found on your given name.

USER: No problem, Thanks for the information.

ASSISTANT: Thank you for contacting us.