You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I aid you?

USER: I want to book a ticket from PHL to SEA. Could you book a ticket?

ASSISTANT: Please provide your trip dates?

USER: Depart is by Dec, 6 and return date is Dec, 8.

ASSISTANT: Do you need any other specifications?

USER: I would like to return in the morning.

ASSISTANT: May I know your name?

USER: My name is Andrew Thompson.

ASSISTANT: There are no flights available on your required dates.

USER: Thank you.

ASSISTANT: Thank you for choosing us.