You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you today?

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

ASSISTANT: Sure, can you share me your trip dates?

USER: My trip dates are Aug 12 and Aug 14 respectively.

ASSISTANT: Do you have any connection limit?

USER: I prefer for connecting flight to travel.

ASSISTANT: Are there any other specifications?

USER: No.

ASSISTANT: May I know your good name?

USER: Christine Lewis here.

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

USER: No issue. Thank you.

ASSISTANT: Thank you for reaching us.