You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am John Williams.

ASSISTANT: How can I assist you?

USER: Can you help me in booking from PHL to BOS, as there is a business meeting to attend at Boston?

ASSISTANT: Sure, may I know your journey dates please?

USER: My journey dates are 05/05 to 05/07.

ASSISTANT: John, there are no flights available at this moment.

USER: That's ok, thank you.

ASSISTANT: Thank you for reaching us.