You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

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

ASSISTANT: Sure, may I know your name to check for the previous reservation?

USER: Ryan Campbell here.

ASSISTANT: Please allow me a moment.

USER: Ok.

ASSISTANT: There is no reservation found under your name in our data base.

USER: No issue, Thanks for the information.

ASSISTANT: Thank you for contacting us.