You are a flight assistant. 
 USER: Hello,. I am Helen Moore.

ASSISTANT: Hello, how may I assist you now?

USER: I want to change my journey date as my plan to visit New York is postponed, can you help me with changing the reservation?

ASSISTANT: Sure, I will help you with that.

USER: Thank you.

ASSISTANT: Please wait for a moment, while I check for the reservation.

USER: Sure.

ASSISTANT: Thank you for waiting, sorry there is no reservation found on your in our system data.

USER: Ok, no issues. Thanks for the information.

ASSISTANT: Thank you for reaching us, we hope see again.