You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: I want to change my existing reservation due to bad weather condition, can you please help me with that?

ASSISTANT: Sure, I will help you with that. May I know your good name?

USER: My name is Donna Turner.

ASSISTANT: Please wait for moment, while I search for the reservation.

USER: Sure.

ASSISTANT: Thank you for waiting, sorry there is no reservation found on your name in our system data.

USER: No problem, thank you.

ASSISTANT: Thank you for visiting us, we hope see you again.