You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you this time?

USER: I would like to change my existing reservation, can you help me in that?

ASSISTANT: Sure, please provide me your name to check your active reservation.

USER: Sure, myself Joseph Carter.

ASSISTANT: Please wait for a while.

USER: Sure, I will wait for your response.

ASSISTANT: We didn't find any reservation on your name.

USER: That's ok, no problem. Thank you for the information.

ASSISTANT: Thank you.