You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Samantha Lewis here.

ASSISTANT: How may I aid you?

USER: Please help me out in booking the ticket from SFO to PHL.

ASSISTANT: Sure, I will help you. May I know on what dates would you like to travel?

USER: My trip dates will be Jan 6 to Jan 8.

ASSISTANT: Do you need connecting flight or direct flight?

USER: I need a connecting flight.

ASSISTANT: Is there any class preference?

USER: No.

ASSISTANT: Do you have any specifications?

USER: My return time must be in the evening.

ASSISTANT: Sorry, there are no flights found on your trip dates.

USER: That's ok, thank you.

ASSISTANT: Thank you for approaching us.