You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you today?

USER: I am George Green.

ASSISTANT: Yes, Green.

USER: I would like to book a ticket to Houston, can you please help me out?

ASSISTANT: Please share your trip dates to proceed further.

USER: I am travelling on these dates 08/06 and 08/08.

ASSISTANT: May I know your airport codes please?

USER: I am flying from DFW to HOU.

ASSISTANT: Wait for a while please.

USER: Sure.

ASSISTANT: Sorry Green, no flight is available on your route.

USER: Ok no problem, thank you for your services.

ASSISTANT: Most welcome, have a great day.