You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: I am Emily Anderson. I want to book a ticket from DCA to IAD to meet my uncle, can you help me in booking?

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

USER: I am departing on 12/21 and return on 12/23.

ASSISTANT: Give me a moment.

USER: Sure.

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

USER: Please proceed for booking. That's fine, thank you for your information.

ASSISTANT: Thank you for contacting us.