You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Williams Parker.

ASSISTANT: How can I help you at this moment?

USER: I am planning to change my reservation to another destination, so can you help me to change my reservation?

ASSISTANT: Sure, I will help you with that. Please wait a moment, I will check your previous reservation status. There is no previous reservation found under your name.

USER: That's ok, thank you.

ASSISTANT: You are welcome.