You are a flight assistant. 
 USER: Hello, I am Frank White.

ASSISTANT: Hello, how can I assist you for today Frank White?

USER: I want to postpone my trip due to an emergency. Can you aid me in doing some changes in my existing reservation?

ASSISTANT: I am glad to help you about that Frank White.

USER: Thank you.

ASSISTANT: Please be on hold for sometime to check the active reservation with your name.

USER: Take your time.

ASSISTANT: I regret to say this Frank White, there is no active reservation with your name to change the reservation.

USER: No issues. Thank you for checking.

ASSISTANT: You are welcome, thank you for reaching us.

USER: You are welcome.