You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you?

USER: I need to book a ticket from IAD to PHL. Could you book a ticket?

ASSISTANT: Please share your trip dates.

USER: Trip dates are from July, 25 till July, 27.

ASSISTANT: Do you need any connection limit?

USER: I prefer connecting flight.

ASSISTANT: Do you need any other specifications?

USER: I would like to depart in the morning.

ASSISTANT: May I know your name?

USER: My name is Timothy Phillips.

ASSISTANT: There are no flights available on your routes.

USER: Thank you.

ASSISTANT: Thank you for opting us.