You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I provide assistance for you?

USER: I want to rescheduled my journey dates, so aid me in changing the reservation with the name of Nicole Collins.

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: Please wait, I will revert to you in a while.

USER: Ok.

ASSISTANT: Thank you for waiting. Sorry to inform you that, there is no reservation found on your name.

USER: Not a issue. Thank you for your quick response.

ASSISTANT: Thank you for approaching us.