You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you now?

USER: I am Alexander Lee, can you assist me in booking my flight ticket which can departure in the morning with a connecting flight?

ASSISTANT: Sure, I am happy to help you with that. Can I have your travel dates please?

USER: Thank you for reacting positively about my query. My travel dates are Aug 19 and Aug 21.

ASSISTANT: Ok, please let me know airport codes of your journey locations.

USER: Sure, my airport codes are IAD and AUS.

ASSISTANT: Are you looking for any specific airlines?

USER: I am comfortable with any of the airlines.

ASSISTANT: Sorry Alexander Lee, no flight is available to you on your dates due to some issues.

USER: Not a problem, anyways thank you for the information.

ASSISTANT: Thank you for choosing us, have a good day.