You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you out?

USER: I am Kevin Green.

ASSISTANT: Ok.

USER:  I made a reservation earlier this week to give a seminar but due to weather conditions I need to change it.

ASSISTANT: Ok.

USER: Can you please help to change my existing reservation?

ASSISTANT: Sure. Please wait for a while, I will revert to you.

USER: Sure.

ASSISTANT: Thanks for your time, We did not find any reservation on your name.

USER: Ok, no problem.

ASSISTANT: Ok.

USER: Thanks for your prompt response.

ASSISTANT: Thank you for reaching us, Have a nice day.