You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Angela Phillips.

ASSISTANT: How can I serve you?

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

ASSISTANT: Sure, let me know your travelling dates?

USER: Sure, I would like to take off on 06/28 and return on 06/30.

ASSISTANT: Do you have any price limit?

USER: Yes, my price limit is 500.

ASSISTANT: Thanks for your details, please wait for a while.

USER: Sure.

ASSISTANT: Sorry to inform that, there is no flights found on your given routes.

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

ASSISTANT: Thanks for reaching us, have a nice day.

USER: You are welcome.