You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Rachel Wilson here.

ASSISTANT: Wilson, how can I assist you?

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

ASSISTANT: Sure, I am here to help you. Let me check your reservation status.

USER: Ok, take your time.

ASSISTANT: Wilson, I did not find any reservation under your name in our website.

USER: Oh! That's sad, thank you for checking with my booking status.

ASSISTANT: You are welcome and thank you very much for contacting us.

USER: Most welcome.