You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you at this moment?

USER: I am willing to book a flight in normal-cost airline from DFW, will you please help me in booking a flight?

ASSISTANT: Sure, I am here to help you. Can you please provide your journey dates?

USER: My planned dates are on Oct 27th to 29th.

ASSISTANT: May I know your destination airport code please?

USER: My destination airport code is PHX.

ASSISTANT: Do you have any connection limit?

USER: I need a connecting flight.

ASSISTANT: May I know your specific depart and arrival timings?

USER: I don't have any preference.

ASSISTANT: May I know your good name please?

USER: Sure, this is Christopher Williams.

ASSISTANT: Christopher Williams, there are no flight services are available on this route with your preferences.

USER: Not a problem, thank you.

ASSISTANT: Thank you for contacting us.