You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: Can you help me to book a flight ticket from OAK to PHL?

ASSISTANT: Sure, can you please mention your departure and arrival dates of your journey?

USER: Oct, 8 and Oct, 10 are my travel dates.

ASSISTANT: Do you like to go with a connecting or direct flight?

USER: I need single connecting flight.

ASSISTANT: Are there any other specifications?

USER: I need to travel in economy class.

ASSISTANT: Please help me with your name for booking.

USER: Melissa Roberts here.

ASSISTANT: Sorry, no flights are available in this route as per your requested dates.

USER: No problem, thank you for the information.

ASSISTANT: Thank you for choosing us.