You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I have to change my flight ticket booking due to some change in my plan, can you please help me in that one?

ASSISTANT: Please provide your name.

USER: Thank you for considering my request and my name is Sarah Perez.

ASSISTANT: Ok. Sorry, no reservation found by your name.

USER: Ok, no problem with that one. Thank you for providing the clarity about my ticket.

ASSISTANT: Thanks. Have a nice day!.