You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you today?

USER: Due to heavy snowfall, I would like to change my existing reservation. Can you help me?

ASSISTANT: Sure, I will help you but I need your name to check that reservation details.

USER: My name is Alexander White.

ASSISTANT: Alexander White, I cannot find a reservation with your name in our database.

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

ASSISTANT: It's my pleasure.