You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

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

ASSISTANT: Sure, I am happy to help you.

USER: Thank you.

ASSISTANT: May I know on which name the reservation has been done?

USER: Sure, my name is Susan Mitchell.

ASSISTANT: Ok, hold on for a moment.

USER: Sure.

ASSISTANT: Let me check. Sorry Susan, there are no flights reserved on your name previously.

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

ASSISTANT: Welcome, thank you for choosing us. Have a great day.