You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Myself Donald Harris.

ASSISTANT: How can I assist you assist you today?

USER: Can you please help me in booking a flight ticket from DFW to IAH locations.

ASSISTANT: Sure, can you please share your preferable travel dates?

USER: Make it sure I need a direct flight please. My travelling dates are from 09/07 and 09/09.

ASSISTANT: Ok, let me check for the availability of flight.

USER: Ok.

ASSISTANT: Donald, I am sorry to inform you that there is no flight available at your requested dates.

USER: It's ok. Thank you for the information.

ASSISTANT: You are welcome. Thank you for contacting us.