You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I would like to spend some more days with my mother, please help me in changing my existing reservation.

ASSISTANT: Sure. May I know your name?

USER: My name is Dorothy Adams.

ASSISTANT: Let me check your recent reservation details.

USER: Sure.

ASSISTANT: Sorry, no reservation found by name Dorothy Adams.

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

ASSISTANT: Thank you. Have a nice day!.