You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I help you?

USER: Due to some entrepreneurship meeting, I am going to change my existing reservation. Can you help me?

ASSISTANT: May I know your name please?

USER: Thomas Hernandez here.

ASSISTANT: Please wait.

USER: Ok.

ASSISTANT: There is no active reservation found under your name.

USER: No problem, thanks for the information.

ASSISTANT: Thank you for choosing us.