You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: Edward Nelson here. Due to snow storm in my place, I will not be able to travel to Philadelphia. Could you amend my reservation?

ASSISTANT: Sure, I can help you with that. Please allow me a minute to check your reservation status.

USER: Ok.

ASSISTANT: Edward Nelson, there is no active reservation found under your name to do modifications in that.

USER: No problem, thank you for assisting me.

ASSISTANT: Thank you for choosing us.