You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you today?

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

ASSISTANT: Sure, may I know your travelling dates?

USER: I want to take off on 04 Dec and return on 06 Dec.

ASSISTANT:  On which name shall I reserve flight ticket?

USER: I am Samantha Garcia.

ASSISTANT: Do you need any specifications?

USER: I would like to return in the evening with a connecting flight.

ASSISTANT: Please wait a moment.

USER: Sure.

ASSISTANT: Sorry, there are no flights available on your travelling dates.

USER: It's ok, not a problem, thank you.

ASSISTANT: Thank you for reaching our service.