You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: I am looking to change my trip details in my recent ticket, can you please help me?

ASSISTANT: Sure, can I know your name please?

USER: Ok, my name is Brenda Davis.

ASSISTANT: Sorry Davis, there is no reservation found on your name.

USER: It's ok, thank you for checking.

ASSISTANT: Thank you for approaching us.

USER: You are welcome.