You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: Can you please make a reservation with direct flight to attend an interview in Dallas?

ASSISTANT: Sure, please share your journey dates?

USER: My journey dates are on Dec 13th and 15th.

ASSISTANT: May I know your airport codes?

USER: My airport codes are, LAS to DFW.

ASSISTANT: Do you have any specifications?

USER: No.

ASSISTANT: May I know your good name?

USER: My name is William Scott.

ASSISTANT: Sorry, no flights found on your given details.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for choosing us.