You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: As my scheduled dates to attend a meeting has been changed.so I want to change my recent reservation.

ASSISTANT: Ok.

USER: Can you help me with it?

ASSISTANT: To change the reservation, may I know your name?

USER: I am Williams Lewis.

ASSISTANT: Thanks for your name. Please hold on, I will check the reservation list and let you know.

USER: Sure.

ASSISTANT: Thanks for waiting. No reservation was there with your name.

USER: Its ok, thank you.

ASSISTANT: Thank you for reaching us.