You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I serve you?

USER: I want to change my reservation, can you help me?

ASSISTANT: Sure, may I know the name on which you have reserved the ticket?

USER: Please check the reservation under the name of Jessica Turner.

ASSISTANT: We didn't find any reservation on your name to make changes.

USER: No problem, thanks for checking.

ASSISTANT: Thank you.