You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you right now?

USER: I would like to change my planned dates, please help me in changing my existing reservation.

ASSISTANT: Sure, I am oblige to help you with that.

USER: Thank you.

ASSISTANT: Can you please provide your name to check your previous reservation status?

USER: Sure, my name is Richard Moore.

ASSISTANT: Please be on hold.

USER: Sure, take your time.

ASSISTANT: We are regret to inform you that, there is no active reservation on your name in our records.

USER: Ok, no problem. Thank you for your information.

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