You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Ashley Williams here.

ASSISTANT: How can I aid you?

USER: Due to inconvenience of my work, I want to change my reservation. Can you please help me for that?

ASSISTANT: Sure, I am glad to help you in modifying your reservation.

USER: Ok, I will wait.

ASSISTANT: Sorry Williams, there is no active reservation have been found under your name in our database to cancel it.

USER: Anyway, thanks for the information.

ASSISTANT: Thank you for reaching us.