You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: I am Daniel Campbell. I want to change my reservation, can you help me?

ASSISTANT: Sure, I will help you. Please, wait a moment.

USER: Sure.

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

USER: Ok, thank you for informing.

ASSISTANT: Thank you for reaching us.