You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you now?

USER: I am Shirley Rodriguez. Can you book a flight ticket in my preferable travel dates June, 20 and June, 22?

ASSISTANT: Sure, I am happy to help with that.

USER: Thank you.

ASSISTANT: Can I have your travel dates please?

USER: I have already mentioned above.

ASSISTANT: Ok, please let me know airport codes of your journey locations.

USER: Sure, my airport codes are PHX and OAK.

ASSISTANT: Do you have any specific timings to travel?

USER: My depart time should be at afternoon and return time should be at morning.

ASSISTANT: Ok, please wait a moment.

USER: Sure.

ASSISTANT: Sorry Shirley Rodriguez, no flight is available to you on your dates.

USER: Ok, not a problem.

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

USER: Thank you.