You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: I would like to change the departure date in my previous reservation because the planned trip got postponed. Can you please help me to change the details?

ASSISTANT: May I know your name please?

USER: Sure, my name is Dorothy Hill.

ASSISTANT: Please wait.

USER: Ok, I will wait for your reply. Please make it fast.

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

USER: It's ok, not an issue with that. Thanks a lot for the information.

ASSISTANT: Thank you for reaching us.

USER: You are welcome.