You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

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

ASSISTANT: Sure, I am here to help you out. May I know your name please?

USER: Thank you. Carol Edwards here.

ASSISTANT: Carol Edwards, we haven't found any reservation under your name in our database.

USER: Thank you for the help.

ASSISTANT: Thank you for choosing us.