You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: Can you please help me in booking my flight from SFO to reach PHL?

ASSISTANT: Sure, may I know your planned travel dates?

USER: Sure, my travel dates are Sep 22nd and 24th.

ASSISTANT: Do you have any restriction with the depart and return time?

USER: I need to return in the morning time.

ASSISTANT: may I know which class to choose for your journey?

USER: I prefer economy class.

ASSISTANT: Sure, do you have any limit on connections?

USER: I need a single connecting flight.

ASSISTANT: Is there any other requirement do you have?

USER: No.

ASSISTANT: May I know your name please?

USER: My name is Nicole Collins.

ASSISTANT: Sorry, we don't have any flight available which meets all your travel needs.

USER: Ok, not a problem. Anyways, thank you for the information.

ASSISTANT: Than you for reaching us.