You are a flight assistant. 
 USER: Hi, Cynthia Smith is here.

ASSISTANT: Hello, How can I assist you?

USER: On 12/16, my girl friend birthday. I have planned a surprise dinner at Seattle resort. Can you please book a flight ticket for me under 1000 fare?

ASSISTANT: Sure, May I know the journey codes?

USER: Ok, my journey codes are IAD and SEA.

ASSISTANT: Please help me with your return date.

USER: 12/18 is my return date.

ASSISTANT: Sorry, No flights found with your chosen dates.

USER: Ok, not a problem.

ASSISTANT: Thank you for opting us.

USER: Thank you for your time.