You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

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

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

USER: My travelling dates are July 18 and July 20.

ASSISTANT: Is there any class preference for you?

USER: No, I am comfortable with any class.

ASSISTANT: May I know your connection limit?

USER: I need a connecting flight.

ASSISTANT: Do you have any other specifications?

USER: I want to depart in the morning.

ASSISTANT: Your good name please.

USER: My name is Debra Scott.

ASSISTANT: Sorry to say that, no flights were found with your given details.

USER: That's ok, thank you for the response.

ASSISTANT: Thank you for reaching us.