You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: Can you please book a flight from LGA to PHL?

ASSISTANT: May I know your desired travel dates please?

USER: I will travel on Dec 13 and 15th.

ASSISTANT: Please wait a while.

USER: Please note I am looking for an economy class ticket.

ASSISTANT: May I know your name please?

USER: My name is Virginia Moore.

ASSISTANT: Do you have any specifications?

USER: I want to depart in the evening.

ASSISTANT: Sorry to say, there is no flight on your desired travel dates.

USER: No worries, thank you.

ASSISTANT: Thank you for opting us.