You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Sarah Hill.

ASSISTANT: Can I help you?

USER: I like to change my reservation for a small reason, can you help me that?

ASSISTANT: Sarah Hill, I did not find any previous reservations on your name.

USER: That's ok.

ASSISTANT: Thanks for reaching us.

USER: Thank you.

ASSISTANT: Have a great day.