You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

USER: I want to visit Charlotte, can you help me in booking a ticket?

ASSISTANT: Sure, I will help you in booking flight ticket. Can you please mention your travel dates for booking flight ticket?

USER: My travel dates are 01/02 and 01/04.

ASSISTANT: May I know your preferable airport codes?

USER: My airport codes are DEN to CLT.

ASSISTANT: Ok, please wait a moment, I will check flight availability.

USER: Ok.

ASSISTANT: Sorry for the inconvenience, no flights available as per your requested dates.

USER: No problem, I will try in another airlines.

ASSISTANT: may I know your name for documentation purpose?

USER: I am Eric Hill, thank you for your information.

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