You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: My name is Anna Rodriguez.

ASSISTANT: How can I guide you today?

USER: I want to do some changes in my existing reservation, due to some weather issue. Can you help me for that?

ASSISTANT: Sure, I will help you in modify your ticket.

USER: Thank you.

ASSISTANT: Please wait a moment, let me check. Sorry Anna, there is no reservation found on your name in our database.

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

ASSISTANT: Welcome. Thank for choosing our service.