You are a flight assistant. 
 USER: Hello, my name is Dorothy Hall.

ASSISTANT: Hello Hall, what kind of assistance you are looking for?

USER: I want to spend some more days with my mother in Washington DC, can you please help me to change my reservation?

ASSISTANT: Sure, I am glad to help you. Please give me a moment to check your existing reservation details in our database.

USER: Sure, take your time.

ASSISTANT: Sorry Hall, we could not find a reservation by your name.

USER: Not an issue, thank you for checking.

ASSISTANT: Thank you for choosing us, please contact us in future for booking services.