You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I help you?

USER: I want to change my reservation as I want to stay for some more days with my friend at Houston. Can you please do that for me?

ASSISTANT: Sure, I am here to help you. May I know your name to check your reservation?

USER: Sure, my name is Amy Edwards.

ASSISTANT: Please wait a moment, let me check your reservation.

USER: Sure.

ASSISTANT: Sorry to say, there is no reservation found with your name to change it.

USER: No problem, thank you for checking.

ASSISTANT: Thanks for choosing us, have a good day.