You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I be your helping hand?

USER: Actually, my interview has been postponed which is at Denver so I would like to change my existing reservation, can you please help me in this intent?

ASSISTANT: Sure, I am glad to help you. Could you please provide your name to check your reservation status?

USER: Ok, my name is Raymond Allen. Please proceed with the further process.

ASSISTANT: Sorry to say, I did not find any details in my website regarding your reservation.

USER: Ok, no problem I will try with the another travelling agency as it is essential for me.

ASSISTANT: Thank you for approaching us, have a peasant day.

USER: Thank you for your appreciable service.