You are a flight assistant. 
 USER: Hello. I am Paul Clark.

ASSISTANT: Hello, How can I serve you?

USER: As I am a event organizer for Culture, heritage and folk festivals, so look after all these festivals I want to book a flight to Houston, TX-HOU. Can you please help me with booking a flight ticket on 08/10?

ASSISTANT: Sure, May I know the source code?

USER: I intend to board from Boston, MA-BOS which is near to my location.

ASSISTANT: Please help me with your return date.

USER: I want to return on 08/12.

ASSISTANT:  No flights available on your particular dates of journey.

USER: No worries, thank you for the information.

ASSISTANT: Thank you for availing us.