You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, How can I assist you?

USER: I am Christopher Carter. I need to book a flight ticket from PHX to JFK, Can you please help me for booking?

ASSISTANT: Sure, May I know the journey dates?

USER: I would like to travel on 09/09 to return on 09/11.

ASSISTANT: Do you have any connection limit?

USER: I need a connecting flight.

ASSISTANT: Do you have any preference in return time?

USER: I would be return on morning.

ASSISTANT: Is there any other requirements?

USER: I need a airline line preference with normal cost.

ASSISTANT: Please wait a moment.

USER: Sure.

ASSISTANT: Sorry, No flights found with your preferable dates.

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

ASSISTANT: Thank you for opting us.