You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: My name is Kathleen Parker. I would like to reserve a flight ticket from DFW to IAH, can you please do it for me?

ASSISTANT: Sure, can you please tell your travelling dates?

USER: Sure, my preferable travelling dates are from 05/04 to 05/06. Make sure my ticket fare should be within the range of 200.

ASSISTANT: Please wait for a moment.

USER: Ok, take your time.

ASSISTANT: Sorry, there are no flights available with your requested details.

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

ASSISTANT: Thank you and have a nice day.