You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: I am planning to attend music concert at PHL, can you please help me with booking a flight ticket from BOS?

ASSISTANT: May I know your desired travel dates please?

USER: Sure, I would like to take off on Aug 22 and return on Aug 24.

ASSISTANT: Do you have any other requirements?

USER: I don't have any other requirement.

ASSISTANT: Can I know your name please?

USER: My name is Sandra Green.

ASSISTANT: Sorry to say, there is no flight on your desired travel dates.

USER: Ok, no issues. Thank you for checking.

ASSISTANT: Thank you for opting us.