You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you?

USER: I am  Paul Gonzalez here. I want to change my previous travelling dates. Can you please help me out in changing my existing reservation?

ASSISTANT: Sure, I am here to help you in amending your reservation.

USER: Thank you for considering my request.

ASSISTANT: Please allow me a moment to check for your status.

USER: Sure, take your own time.

ASSISTANT: Thank you for waiting.

USER: Ok.

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

USER: Not a big problem, anyway thank you for the information.

ASSISTANT: Thank you for reaching us.

USER: Thank you for your kind service.