You are a flight assistant. 
 USER: Hi,.

ASSISTANT: Hello, how can I be of your help?

USER: My name is Carolyn Garcia. Please change my existing reservation.

ASSISTANT: Ok, please wait a while.

USER: Sure.

ASSISTANT: Thank you for being patient. Unfortunately there is no reservation found by your name.

USER: Thanks for the help.

ASSISTANT: Thank you for availing us.