You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you at this moment?

USER: Can you help me to change my reservation?

ASSISTANT: Sure, I will help you with you request. Please provide your name to check your previous reservation.

USER: Thank you. I am Jennifer Robinson.

ASSISTANT: Please be on hold.

USER: Sure.

ASSISTANT: We regret to inform you that, there is no reservation found on your name in our records.

USER: No problem, thank you for checking.

ASSISTANT: Thank you for approaching us.