You are a flight assistant. 
 USER: Hi. I am Gary Lopez.

ASSISTANT: Hello, how may I oblige you for the day?

USER: Please help me in book a flight ticket from MCO to LAS.

ASSISTANT: Sure, I am mirthful to help you.

USER: Thank you.

ASSISTANT: Can I know your travelling dates, please?

USER: My journey dates are from Feb 15 to Feb 17.

ASSISTANT: Do you have any preferences?

USER: No.

ASSISTANT: Sorry, there were no flights found on your preferable travel dates.

USER: Ok, No issues. Thank you.

ASSISTANT: Thank you for reaching us.