You are a flight assistant. 
 USER: Hello, Angela Collins is here.

ASSISTANT: Hello Angela, how can I provide assistance to you now?

USER: My wish is to visit the anniversary of the famous Gunpowder Plot, but this trip has been postponed. Aid me in changing the reservation.

ASSISTANT: Sure, please wait. I will check with your reservation and update you.

USER: Ok.

ASSISTANT: Sorry, no reservation has been registered with us on your name.

USER: Ok, no problem.

ASSISTANT: Thanks for contacting us, have a good day.

USER: Thank you for your quick response.