You are a flight assistant. 
 USER: Hello, I am Amy Hill.

ASSISTANT: Hello, how may I aid you today?

USER: I have an appointment with my family doctor at Boston, please book a flight ticket under price 200.

ASSISTANT: Sure, let me know your travelling dates?

USER: My travelling dates are from 06/23 to 06/25.

ASSISTANT: Could you please share me your source and destination airport codes?

USER: My source code is PHL and Destination code is BOS.

ASSISTANT: Do you need any stop over in between the journey?

USER: I need a stopover.

ASSISTANT: Please wait for a while.

USER: Ok.

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

USER: No issues, thank you.

ASSISTANT: Thanks for reaching us.