You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, How can I serve you?

USER: Stephen Smith here, want to go Washington to complete my movie story over there. Please book me a ticket to IAD.

ASSISTANT: Sure, May I know the source code?

USER: Sure, I will board at BOS.

ASSISTANT: Please help me with your travel dates.

USER: I will depart on 08/29 and back on 08/31.

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

USER: Ok, not an issue.

ASSISTANT: Thank you for opting us.

USER: Thank you for your response.