You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: Can you please help me to change my existing reservation, due to bad weather conditions?

ASSISTANT: Sure, I will help you to change your reservation.

USER: Thank you.

ASSISTANT: May I know your good name?

USER: My name is Andrew Lopez.

ASSISTANT: Please wait for a 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 to change it.

USER: Ok, thank you.

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