You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you?

USER: I am William Jackson want to book a ticket to Boston, BOS to attend a business meeting, can you please help me in booking a ticket on 07/13?

ASSISTANT: Ok, provide me your journey  date?

USER: My arrival date is on 07/15.

ASSISTANT: May I know your source point?

USER: My source point is at New York, NY-LGA.

ASSISTANT: Ok, please wait.

USER: Ok.

ASSISTANT:  Sorry, no flights are found on your requested dates.

USER: Ok, thank you.

ASSISTANT:  Thank you for availing us.