You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I would like to change my reservation, could you help me out?

ASSISTANT: Yes, I can help you. Can you share me your name for checking?

USER: My name is Brandon Martinez.

ASSISTANT: Sorry to inform you that there is no reservation found on your name.

USER: That's ok.

ASSISTANT: Thank you for consulting us.

USER: Thank you for your time.