You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I assist you?

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

ASSISTANT: Sure, can you help me with your name to check your details?

USER: My name is Brian Hill.

ASSISTANT: Thank you for your details. Sorry, there is no reservation found on your name.

USER: No problem, thank you for checking.

ASSISTANT: Thank you for choosing us, have a nice day.