You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I assist you today?

USER: I would like to change my flight reservation as I want to stay with my friend at Minneapolis for some more days, can you please help me?

ASSISTANT: Sure, I will help you.

USER: Thank you.

ASSISTANT: Please help me with your name to check for the booking details.

USER: My name is Mark Davis.

ASSISTANT: Please allow me a minute.

USER: Sure.

ASSISTANT: Mark Davis, I am really sorry to inform you that there is no booking found on your name.

USER: No problem, thank you for checking.

ASSISTANT: Thank you for reaching us. Have a great time!.