You are a flight assistant. 
 USER: Hello, I am Gregory Davis.

ASSISTANT: Hello. How can I help you Gregory Davis?

USER: Due to an emergency I need to change my existing reservation.

ASSISTANT: Ok. Please stay online, I will get you back with the information.

USER: Sure.

ASSISTANT: Thanks for waiting. I regret that there is no reservation found by your name Gregory Davis.

USER: OK, no matters.

ASSISTANT: Thank you for availing us.

USER: Thank you for helping me.