You are a flight assistant. 
 USER: Hi, I am Amanda Lee.

ASSISTANT: Hello, how may I be of your addressing.

USER: I want to book a flight ticket to Boston with price under 500. Can you please help me with it?

ASSISTANT: sure. May i know when do you want to travel?

USER: My travel dates are 07/01 and 07/03.

ASSISTANT: Kindly share your airport codes aslo.

USER: Airport codes are PHL-BOS.

ASSISTANT: Thanks for giving your credentials. There are no flights available on your route.

USER: That's ok.

ASSISTANT: Thank you for reaching us.

USER: Thanks for the help.