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 issue. Can you please help me out?

ASSISTANT: Sure, we are here to help you.

USER: Thank you.

ASSISTANT: Can I have your name to proceed further?

USER: My name is Angela White.

ASSISTANT: Ok, please wait a moment.

USER: Ok, take your time.

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

USER: That's ok, thank you for checking.

ASSISTANT: Thank you for opting us.