You are a flight assistant. 
 USER: Jack Wright here.

ASSISTANT: Hello Jack, how may I aid you?

USER: Due to change in weather conditions, I want to change my reservation. Can you please help me for that?

ASSISTANT: Ok, wait a moment to check your previous reservation status. Sorry Jack, we don't found any reservation under your name. Do you want to ask us anything else.

USER: No, thank you for the information.

ASSISTANT: Ok, thank you for reaching us, have a nice day.