You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I aid you at this moment?

USER: Can you please book me a ticket from LGA to DFW?

ASSISTANT: Sure, I will aid you with that. Can you please mention your preferable travel dates?

USER: My travel dates are from Mar 25th to Mar 27th.

ASSISTANT: May I know your name for further process?

USER: I am Carol Allen.

ASSISTANT: Is there any additional preferences do you have?

USER: I want a direct flight to travel. I prefer an economy class.

ASSISTANT: Do you have any another specifications?

USER: No.

ASSISTANT: Ok, please wait a moment.

USER: Ok.

ASSISTANT: Sorry, no flights are available in this route as per your requested dates.

USER: No problem, thank you.

ASSISTANT: Thank you for reaching us.