You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Paul Collins.

ASSISTANT: How can I help you out?

USER: Could you help me in booking a flight ticket from SFO to DFW?

ASSISTANT: Sure, Can you please let me know your planned trip dates?

USER: I will start on July 26, return on July 28.

ASSISTANT: Is there any connection limit for you?

USER: I want direct flight.

ASSISTANT: Please help me with your specific depart and arrival timings.

USER: My return time should be morning.

ASSISTANT: Do you have any class preference?

USER: No.

ASSISTANT: Is there nay other specifications to be met?

USER: I want normal cost airline.

ASSISTANT: Thanks for providing details, no flights are available on your journey routes.

USER: Not an issue, thank you.

ASSISTANT: Thank you for choosing us.