You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I assist you today?

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

ASSISTANT: Sure, may I know your name to check the status of previous reservation?

USER: Myself Stephanie Carter.

ASSISTANT: Please allow me a moment to check for the previous reservation.

USER: Ok.

ASSISTANT: Stephanie, there is no reservation found under your name.

USER: No problem, thanks for checking.

ASSISTANT: You are welcome. Thank you for contacting us.