You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you?

USER: I would like to travel from LGA to DFW as a business trip.

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

USER: My trip dates are 10/08 and 10/10.

ASSISTANT: Ok, may I know your name?

USER: Lisa Lewis here.

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

USER: No problem, Thanks for the information.

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