You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Kenneth Young.

ASSISTANT: How may I guide you today?

USER: Can you help me in changing my previous reservation?

ASSISTANT: Sure, I will help you with that.

USER: Thanks.

ASSISTANT: Wait for a moment, I will get back with your details.

USER: Sure.

ASSISTANT: I am sorry to say that there is no reservation found under your name.

USER: That's fine. Anyway, thank you for your help.

ASSISTANT: Thank you for reaching us.