You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I am Carolyn King. Can you please help me in booking a flight ticket from PHX to JFK?

ASSISTANT: May I know your desired travel dates please?

USER: I would like to fly on 05/21 and return on 05/23.

ASSISTANT: Do you have any other preferences? There is a flight with connection limit 0 and fare 200, shall I proceed for booking?

USER: I would like to depart in the morning time.

ASSISTANT: Sorry to say, there is no flight on your desired travel dates.

USER: Not an issue. Thank you.

ASSISTANT: Thank you for opting us.