You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Myself Catherine Taylor.

ASSISTANT: How may I help you out?

USER: I am planning to visit Dallas, will you help me in booking the flight ticket from MCO to DFW?

ASSISTANT: Sure, I will help you in booking the ticket. May I know your travelling dates please?

USER: My travelling dates are Aug 20 and Aug 22.

ASSISTANT: Do you need any specifications?

USER: I need a flight with single connection which departs in evening and return in afternoon time in business class.

ASSISTANT: Can I know your any other preferences?

USER: No, thank you.

ASSISTANT: Sorry, there are no flights found.

USER: Ok, not an issue.

ASSISTANT: Thank you for reaching us.

USER: Thank you for your infomation.