You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I aid you?

USER: I want to make some changes in my reservation, could you please help me with that?

ASSISTANT: Sure, I am here to help you out. Please provide me your name to check with your reservation details.

USER: Sure, my name is Cynthia Phillips.

ASSISTANT: Sorry, I can't help you in modifying the reservation because I didn't find any reservation on your name.

USER: Oh! That's fine, thank you for checking.

ASSISTANT: Thank you for reaching us.