You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I help you?

USER: Please help me out in changing my recent reservation.

ASSISTANT: Yes, can you tell me your name?

USER: Stephanie Walker is my name.

ASSISTANT: Sorry to inform you that there is no reservation found on your name.

USER: That's ok, thank you.

ASSISTANT: Thank you for contacting us.