You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you?

USER: I need your help in booking a flight ticket. Please help me.

ASSISTANT: Sure, We are here to help you.

USER: Thank you.

ASSISTANT: Can I know your travelling dates?

USER: September 26 and 28 are my planned travelling dates.

ASSISTANT: Please share me your airport codes.

USER: DFW  and HOU are the respective airport codes.

ASSISTANT: May I know your name?

USER: My name is Ashley Parker.

ASSISTANT: Is there any other specifications?

USER: Nothing much but I need a direct flight.

ASSISTANT: Ok. We are unable to provide flight in between your journey routes due to some technical up-gradation at destination airport.

USER: Oh! Is it so. That's ok. Thanks for your time.

ASSISTANT: Thank you for reaching us.