You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: Will you please help me to change the travel dates in the previous reservation? Because the planned trip got postpones suddenly.

ASSISTANT: Sure, I can help you with that. May I know your good name please?

USER: Thank you for accepting my request. My name is Nancy Moore.

ASSISTANT: Nancy Moore, there is no active reservation under your name to do changes in that.

USER: It's ok, not a problem with that. Thank you for checking the ticket status.

ASSISTANT: Thank you for choosing us.