You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I serve you?

USER: I need to modify my previous flight ticket booking, can you please help me with that one?

ASSISTANT: Sure, I can help you.

USER: Thank you for considering my request.

ASSISTANT: May I know your name?

USER: Sure, my name is Linda Perez.

ASSISTANT: Please wait a while.

USER: Yes, take your own time.

ASSISTANT:  Sorry, we couldn't find a reservation on your name to change.

USER: Not a problem, thank you for checking my reservation status.

ASSISTANT: Thank you for picking us.

USER: Welcome.