You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you today?

USER: I want to change my existing reservation, due to some health issues. Can you please help me out with it?

ASSISTANT: Sure, we are here to help you.

USER: Thank you for the response.

ASSISTANT: Can I have your name to proceed further?

USER: Alexander Allen is my name.

ASSISTANT: Ok, please wait moment.

USER: Ok, sure.

ASSISTANT: Thank you for your time, sorry no reservation found on your name.

USER: Ok, not an issue. Anyways, thank you for the information.

ASSISTANT: Thank you for availing us.