You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Kevin Hernandez.

ASSISTANT: How may I serve you?

USER: I want to book a flight ticket from TX-DFW to TX-HOU, help me in booking my flight ticket with a connecting flight.

ASSISTANT: Sure, help me with the trip dates?

USER: 09/15 is my starting date, my return date would be 09/17.

ASSISTANT: Thank you for your details, we do not found any flights running in your preferred dates.

USER: Its ok, thank you for your effort.

ASSISTANT: Thank you for reaching us.