You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Timothy Adams.

ASSISTANT: By which way, can I be at your service?

USER: I would like to spend free time with my grand parents in Boston.

ASSISTANT: Ok.

USER: Will you please help me to get a flight ticket?

ASSISTANT: Sure. To book a ticket, please share your travelling dates.

USER: My travelling dates are 04/03 and 04/05.

ASSISTANT: What is your boarding point?

USER: My boarding point is DC-IAD.

ASSISTANT: Do you have any specifications to be met?

USER: I need a halt. Price limit is below 500.

ASSISTANT: Let me know your landing point.

USER: I would like to land at MA-BOS.

ASSISTANT: Please standby.

USER: Ok.

ASSISTANT: Unfortunately, we have no flights found with your information.

USER: Ok, not an issue.

ASSISTANT: Thank you for reaching us.

USER: Thank you for your help.