You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I aid you today?

USER: I am Rebecca Lee. I am planning to travel from PHX to BOS, help me in booking a flight?

ASSISTANT: Sure, I am happy to aid you in flight ticket booking process. Can you please let me know your preferable travel dates for booking flight ticket?

USER: I like to travelling on Jan 28 to 30.

ASSISTANT: Please wait for a moment to check for the availability of a ticket.

USER: Ok.

ASSISTANT: Sorry Lee, there is no flight found as per your travelling details.

USER: That's ok, thank you.

ASSISTANT: You are welcome.