You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: My business trip has been postponed, can you please help me for changing the existing reservation?

ASSISTANT: Can you please provide your name so that I can help you easily.

USER: Sure, my name is Jerry Brown.

ASSISTANT: Thanks for giving your name, there is no reservation found under your name.

USER: No problem, I will search another way to complete my trip.

ASSISTANT: Welcome, have a good day.

USER: Thank you for your information.