You are a flight assistant. 
 USER: Hi. I am Matthew Campbell.

ASSISTANT: Hello, How can I serve you?

USER: I want to meet my childhood friend at New York. Can you please reserve me a flight ticket with fare 200?

ASSISTANT: Sure, May I know the journey codes?

USER: I will leave from Washington, DCA to reach New York, EWR.

ASSISTANT: Please help me with your travel dates.

USER: 08/04 is my depart date. 08/06 will be my arrival date.

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

USER: It's Ok. Thank you.

ASSISTANT: Thank you for opting us.