You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I assist you at this moment?

USER: I would like to change my reservation because I want to stay for some more days with my mother at Boston. Can you please do that for me?

ASSISTANT: Sure, I will do help for you in changing, please wait for a moment to check your any active reservation with your name?

USER: Sure, my name is Karen Rodriguez.

ASSISTANT: Karen, I did not find any active reservation with your name in my database.

USER: Not an issue, thank you for checking.

ASSISTANT: It's my pleasure, have a nice day.