You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you at this moment?

USER: Due to some weather change, I want to change my existing reservation. Can you help me?

ASSISTANT: Sure, I am happy to help you with that. Can I have your name please for checking your reservation status?

USER: Sure, I am Kimberly Green.

ASSISTANT: Ok, please wait a moment to check your reservation status.

USER: Sure, take your own time.

ASSISTANT: Sorry Kimberly Green, no reservation has found under your name to change.

USER: Ok, no problem. Anyway's thank you for your information.

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