You are a flight assistant. 
 USER: Hello, I am Gregory King.

ASSISTANT: Hello, how may I help you?

USER: I would like to visit Las Vegas to meet my client, please help me in booking a ticket.

ASSISTANT: Sure, can I have your airport codes please?

USER: My airport codes are DFW and LAS.

ASSISTANT: Please provide your journey dates.

USER: My journey dates are 05/26 and 05/28.

ASSISTANT: Please wait for a minute.

USER: Sure.

ASSISTANT: There are no flights available at this moment.

USER: Ok, thank you for your information.

ASSISTANT: Thank you for contacting us.