You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I want to change my existing reservation due to bad health issues. Can you help me in doing that?

ASSISTANT: Sure, wait a while.

USER: Ok.

ASSISTANT: Sorry to say, there is no reservation on your name in our database. May I know your name please?

USER: Ok, not a problem. I am Amy Edwards. Thank you for your information.

ASSISTANT: Thank you for opting us.