You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I assist you today?

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

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

USER: Jeffrey Lee is my name.

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

USER: Sure, take your time.

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

USER: No problem, thank you.

ASSISTANT: Thank you for contacting us.