You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Myself Joseph Jackson.

ASSISTANT: How can I help you?

USER: Can you help me to amend my existing reservation?

ASSISTANT: Sure, just a moment please.

USER: Ok, thank you.

ASSISTANT: I am sorry no reservation found on your name.

USER: That's ok, thank you for the information.

ASSISTANT: Thank you.