You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I guide 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 here to help you. Can I know your name please?

USER: My name is Joshua White.

ASSISTANT: Ok, please give me a minute. I will check the ticket status and get back to you.

USER: Ok, I will wait.

ASSISTANT: Sorry to inform you that, there is no active reservation found with your name to change the ticket details.

USER: Anyway, thanks for the information.

ASSISTANT: You are most welcome. Thank you for consulting our agency.