You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

USER: I am Jeffrey Thomas. Please book a ticket from PHX to BOS.

ASSISTANT: Sure, can you please share your travel dates?

USER: 05/06 and 05/08 are my desired travelling dates.

ASSISTANT: Let me check for the availability of flight. Jeffrey, I am sorry to inform you that there is no flight available at your request.

USER: No problem, thank you for informing.

ASSISTANT: Thank you for contacting us, have a great day.