You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I guide you today?

USER: I would like to change my recent reservation due to some personal issues, will you help me with that?

ASSISTANT: Sure, I am oblige to help you with that.

USER: Thank you for accepting my request.

ASSISTANT: Please provide your name to check your previous reservation.

USER: Myself Kevin Clark.

ASSISTANT: Please wait a moment.

USER: Ok, I will wait.

ASSISTANT: We regret to inform you that, there is no reservation found on your name in our reservation list.

USER: Ok, not an issue. Thank you for your information.

ASSISTANT: Thank you for reaching to our services, hope you have a great day.