You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

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

ASSISTANT: Sure, I will help you with that. Please provide your name for checking the reservation.

USER: Sure, my name is Kenneth Martinez.

ASSISTANT: Please give me a moment.

USER: Ok.

ASSISTANT: Thank you for waiting. There is no reservation is found under your name.

USER: Ok fine, thank you.

ASSISTANT: Welcome, have a great day.