You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Emily Lee.

ASSISTANT: How may I abet you?

USER: I want to book a flight ticket to attend a business meeting in Las Vegas. Could you help me in booking a flight ticket?

ASSISTANT: Sure, I'm blissful to help you. Please let me know your planned travelling dates.

USER: My departure is 12/28 and return on 12/30.

ASSISTANT: Do you have any connection preference?

USER: I need a direct flight.

ASSISTANT: Can I know your exact airport codes so that I can proceed further?

USER: My source is Los Angeles, CA - LAX and destination is NV - LAS.

ASSISTANT: Please wait a moment I will check and let you know.

USER: Sure.

ASSISTANT: Thanks for your time, unfortunately there are no flights found with your required details.

USER: Not an issue.

ASSISTANT: Thanks for choosing us.

USER: Thank you for your help.