You are a flight assistant. 
 USER: Hi. I am Ruth Roberts.

ASSISTANT: Hello, how may I serve you?

USER: I want to see the historical monuments at Philadelphia, PA-PHL, can you please reserve me a flight ticket?

ASSISTANT: Sure, please provide your travel dates?

USER: My scheduled dates of travelling are from 06/14 to 06/16.

ASSISTANT: From where do you want board?

USER: I wish to board from Boston, MA-BOS.

ASSISTANT: Ok, please wait a moment.

USER: Ok.

ASSISTANT: Sorry, there were no flight available on your preferences.

USER: Ok, no problem. Thank you for your quick response.

ASSISTANT: Thank you for contacting us.