You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: I want to change my existing reservation, due to bad weather conditions. Can you please help me to change reservation ?

ASSISTANT: May I know your name?

USER: My name is Elizabeth Thompson.

ASSISTANT: Sorry, no reservation found on your name.

USER: Ok, no problem. Anyways, thanks for the information.

ASSISTANT: Thank you for reaching us.