You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I aid you?

USER: Myself Michelle Clark. Due to some entrepreneurship meeting, I am going to change my existing reservation. Can you please help me in changing the reservastion?

ASSISTANT: Sure, please wait for a while.

USER: Sure, I will wait for your response.

ASSISTANT: Sorry, there are no reservation found on your name. Have a great day.

USER: Not a big deal, anyhow thank you very much for your service.

ASSISTANT: Thank you for approaching us.