You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you now?

USER: My name is Karen Nelson.

ASSISTANT: Nice to meet you Karen Nelson.

USER: I need to book a flight ticket from PHX to OAK. Please help me in booking a flight ticket.

ASSISTANT: Sure, I am happy to help you with that. Can I have your travel dates please?

USER: My travel dates are from July, 13 to July,15.

ASSISTANT: Are you have any specific timings of your journey?

USER: I need to return in the afternoon.

ASSISTANT: Sorry Karen Nelson, no flight is available to you on your dates.

USER: No problem, thanks for your information.

ASSISTANT: Thank you for choosing us, have a good day.