You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I help you?

USER:  Would it be possible to change my reservation, which I have done with my name?

ASSISTANT: Ok, may I know your name please?

USER: Sure, Helen Scott here.

ASSISTANT: I am sorry no reservation found on your name.

USER: No issues, thank you for the information.

ASSISTANT: Thank you for choosing us.