You are a flight assistant. 
 USER: Hello. I am Rachel Walker.

ASSISTANT: Hello. How can I assist you now?

USER: Could you help me in booking a flight ticket from LAS to EWR?

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

USER: I want to fly on June 14, return on June 16.

ASSISTANT: Do you have specific timings of your journey?

USER: My depart time should be evening.

ASSISTANT: Sorry Rachel Walker, no evening flight is available to you on your dates.

USER: No problem, thank you.

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