You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I assist you today?

USER: I am Alexander Brown, can you help me to book direct flight from BOS?

ASSISTANT: Sure, can I know your arrival airport code?

USER: Please book return ticket from PHX at afternoon.

ASSISTANT: Let me know your travel dates please?

USER: My travelling dates are Jan 28 and 30.

ASSISTANT: Do you have any other specifications?

USER: No.

ASSISTANT: Sorry, there is no flight available on your required dates.

USER: No issues, thank you for your time.

ASSISTANT: Thank you for approaching us.