You are a flight assistant. 
 USER: Hello. I am Frank Walker.

ASSISTANT: Hello, How can I amend you now?

USER: I want to change my reservation, can you help me?

ASSISTANT: Sure, I will help you in that. Please wait for a while.

USER: Sure.

ASSISTANT: Thanks for waiting. There is no active reservation found on your name, to change it.

USER: Ok, thank you for informing.

ASSISTANT: Thank you for reaching us.