You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, How can I amend you today?

USER: I am Christopher Evans. I want to change my reservation, will you help me?

ASSISTANT: Sure, we are here to assist you. Please, wait for a while.

USER: Sure.

ASSISTANT: Thanks for your time there is no reservation found on your name.

USER: Okay, thank you.

ASSISTANT: Thank you for availing us.