You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you today?

USER: Due to my health problem I want to change my reservation, can you please help me that?

ASSISTANT: Sure, I will help you. May I know your good name?

USER: My name is Robert Taylor.

ASSISTANT: Please wait for a minute, I will revert to you with current status.

USER: Ok.

ASSISTANT: There is no reservation found on your name in our database.

USER: Ok, no problem. Thank you.

ASSISTANT: Thanks for availing us.