You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: I am Larry Adams. I need to book a ticket to meet my teacher on her birthday. Could you please help me in doing that?

ASSISTANT: Sure, may I know your travel dates?

USER: My travelling dates are 03/14 and return on 03/16.

ASSISTANT: Please share me your airport codes?

USER: My travelling airport codes are DFW and LAS.

ASSISTANT: Sorry currently there is no flight available on your route.

USER: No problem, thank you for your information.

ASSISTANT: Thank you.