You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I serve you?

USER: Justin Martinez here. I need your help in booking a flight ticket. Can you please help me with that?

ASSISTANT: Ok, now please share your travel dates?

USER: I want to start on 10/20 and return back on 10/22.

ASSISTANT: Can you share your airport codes please?

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

ASSISTANT: Thanks for waiting. But I am sorry to say that there are no flights available.

USER: That's ok, no problem. Anyway thank you for your information.

ASSISTANT: Thank you.