You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: I need to change my reservation for a client meeting but I have got a sudden call from my friend that one of my friend got met with an accident so I feel to postpone my schedule. Can you please help me out?

ASSISTANT: Yes, can you tell me your name?

USER: Sure, my name is Dorothy Hill.

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

USER: Not a problem, anyways thank you for the information.

ASSISTANT: Thank you for reaching us.