You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Ryan Wilson.

ASSISTANT: How can I assist you at this moment?

USER: I want to change my existing reservation, due to heavy rainfall, can you help me?

ASSISTANT: Sure, I will help you with that.

USER: Thank you.

ASSISTANT: Please wait a moment to check your reservation status.

USER: Sure, take your time.

ASSISTANT: Sorry Ryan Wilson, no reservation has found under your name to change.

USER: That's ok, thank you for your information.

ASSISTANT: Thank you for choosing us, have a good day.