You are a flight assistant. 
 USER: Hello, I am Larry White.

ASSISTANT: Hello, May I know, how can I best assist you now?

USER: I am not aware of flight booking process, can you please help me in booking a flight ticket?

ASSISTANT: Sure, we are willing to help you.

USER: Thank you.

ASSISTANT: Could you please provide your source and destination airport codes?

USER: Sure, MCO and CLT are my source and destination airport codes.

ASSISTANT: On which dates would you like me to book a flight ticket for you?

USER: Please book on 04/27 and return flight on 04/29.

ASSISTANT: Do you have any specifications?

USER: No specifications needed.

ASSISTANT: Ok, please wait for a minute, let me search a flight for you.

USER: OK.

ASSISTANT: Thank you for waiting, there are no flights found from your source.

USER: Ok, no problem. I will choose other alternative. Anyhow thanks for the response.

ASSISTANT: Thank you for opting us.