You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: I am Angela Phillips here. I need to change my existing reservation, as my planning trip got postponed. Can you please help me out?

ASSISTANT: Sure, I will help you and please allow me a moment to check it.

USER: Thank you for considering my request. Sure, take your own time.

ASSISTANT: I regret to inform you that there is no reservation found on your name.

USER: Not an issue, anyway thank you for the information.

ASSISTANT: You are most welcome and thank you for reaching us.