You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: I want to change my recent reservation, help me in changing my recent reservation.

ASSISTANT: Sure, may I know your name?

USER: I am Roberts White.

ASSISTANT: Please wait a moment, I will check the reservation list.

USER: Sure.

ASSISTANT: Thanks for waiting. unfortunately there is no active reservation on your name.

USER: Its ok, thank you.

ASSISTANT: Thank you so much for choosing us.