You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I guide you today?

USER: My manager has changed the venue of the meeting. So, I would like to change my existing reservation.

ASSISTANT: Please tell me your name?

USER: My name is Anthony Perez.

ASSISTANT: Please wait for a moment.

USER: Ok.

ASSISTANT: Sorry Perez, no reservation found under your name.

USER: That's fine. Thank you for the information.

ASSISTANT: Thank you for reaching us.