You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: I am Steven Clark. I want to change my existing reservation due to change in my plan. Can you help me out?

ASSISTANT: Sure, I can help you. Please wait. I will check the reservation status and let you know.

USER: Sure.

ASSISTANT: Thanks for your time. There was no reservation found on your name.

USER: Ok, No problem.

ASSISTANT: Thank you for contacting us. Have a good day.

USER: Thanks for the information.