You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: I want to go to Washington next week so can you please help me in flight ticket booking process from DCA to IAD?

ASSISTANT: Yes, can you tell me your travelling dates?

USER: Thank you for your response, I want to take off on Dec 18 and book my return ticket also on Dec 20.

ASSISTANT: Do you have any other specifications?

USER: I want to travel economy class flight.

ASSISTANT: Sorry to inform you that there are no flights found on your requested dates.

USER: Oh! It's ok no problem.

ASSISTANT: Can I know your name for documentation?

USER: Sure, my name is Deborah Thompson.

ASSISTANT: Thank you for reaching us.

USER: Thank you for your information.