You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you at present?

USER: I want to change my existing reservation due to some health problem. Can you help me with that?

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: May I know your name please?

USER: Pamela Garcia here.

ASSISTANT: Ok, please give me sometime.

USER: Sure.

ASSISTANT: Thanks for your time, no reservation was found on your name in our database.

USER: That's ok, no problem. Thank you.

ASSISTANT: Thank you for availing us.