You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: Can you help me to book a connecting flight from PHL to LGA?

ASSISTANT: Sure, can I know the travel dates please?

USER: My travelling dates are 18 and 20 of Sep.

ASSISTANT: May I know your name please?

USER: Myself Debra Anderson.

ASSISTANT: Do you have any requirements?

USER: I would like to return in the afternoon.

ASSISTANT: Ok, wait a moment please.

USER: Sure.

ASSISTANT: Sorry, there are no flights available as per your request.

USER: Oh! very sad to hear, thank you.

ASSISTANT: Thank you for approaching us.