You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Justin Carter.

ASSISTANT: How can I assist you?

USER: As my conference meeting dates  has been changed, help me in changing my recent reservation.

ASSISTANT: Ok, please wait.

USER: Sure.

ASSISTANT: Sorry, no reservation found on your name to change.

USER: Ok, I think it has been reserved with other airline.

ASSISTANT: Thank you for reaching us.

USER: Any way thank you for your effort in finding my reservation.