You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I assist you now?

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

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

USER: Sure, my name is Charles Walker.

ASSISTANT: Please wait a moment to check reservation status.

USER: Ok.

ASSISTANT: Sorry Charles, no reservation has found under your name.

USER: That's ok, thank you.

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