You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you today?

USER: Can you please book a flight ticket from DFW to HOU?

ASSISTANT: Sure, I am here to help you in booking. Can you please share your travel dates?

USER: My trip dates are 07/21 and 07/23.

ASSISTANT: Ok, please share your name.

USER: I am Jerry Walker.

ASSISTANT: Sorry, No flights are available on your preferable travel dates.

USER: Please check again with a connecting flight.

ASSISTANT: As per your request, I have rechecked again but no flights are available on your preferable travel dates.

USER: That's ok, thank you for your information.

ASSISTANT: Thank you for reaching us, have a nice day.