You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: I am Kevin Walker. I need to book a flight ticket from BOS to PHX, Can you please help me for booking?

ASSISTANT: Please share me your travel dates?

USER: I would like to travel on 06/15 to return on 06/17.

ASSISTANT: Sorry there is no flight on your details.

USER: Ok, no problem. Thanks for your information.

ASSISTANT: Thank you.