You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you today?

USER: I want to change my reservation from low-cost airline to normal cost airline. Can you help me?

ASSISTANT: Sure, I will help you in changing your reservation. Can I know your good name?

USER: My name is Christopher Allen.

ASSISTANT: Please give me a minute.

USER: Sure.

ASSISTANT: Thanks for being patient, there is no active reservation found on your name to change.

USER: Ok, thank you for the information.

ASSISTANT: Thank you for availing us.