You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Joshua Scott.

ASSISTANT: How may I guide you today?

USER: I need to modify my reservation which I have done last week to attend a client meet in Denver but now I want to change my destination as Las Vegas. Can you help me with that?

ASSISTANT: Sure, I will help you with that.

USER: Thank you for considering my request.

ASSISTANT: Please wait a moment to check your previous reservation.

USER: Sure, I will wait for your response.

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

USER: It's ok, my reservation might be cancelled by my manager for the new reservation with change in my destination. Anyways thank you for the information.

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