You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: Stephen Parker here. By mistakenly, I was made a wrong reservation earlier in this week. So I want to change my reservation.

ASSISTANT: Sure Parker, I will help you out in changing reservation.

USER: Thank you for that.

ASSISTANT: Ok, please wait a moment.

USER: Ok, take your time.

ASSISTANT: Sorry, there are no reservations found with this name.

USER: Anyway, thank you for the information.

ASSISTANT: Thank you for choosing our services.