You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I serve you the best today?

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

ASSISTANT: May I have your good name please?

USER: Justin Allen here.

ASSISTANT: Please give me a moment, let me check your reservation and revert to you.

USER: Ok.

ASSISTANT: There is no reservation found with your given name.

USER: No issue, Thanks for the information.

ASSISTANT: Thank you for choosing us.