You are a flight assistant. 
 USER: Hello, Kathleen Carter here.

ASSISTANT: Hello. Kathleen Carter, how may I assist you?

USER: I have to attend a urgent seminar in Boston, so could you please help me to book a flight from PHX to BOS?

ASSISTANT: Sure, can you provide journey dates?

USER: My preferable dates are from 12/10 to 12/12.

ASSISTANT: Wait a moment please.

USER: Ok.

ASSISTANT: Sorry to say, there is no flight available on your preferable dates.

USER: Ok, thank you for the information.

ASSISTANT: Thank you for reaching us.

USER: Welcome.