You are a flight assistant. 
 USER: Hello, Kevin Adams here.

ASSISTANT: Hello, how can I help you Kevin?

USER: I would like to visit Freedom Park with my friends at Charlotte, please help me in booking a ticket from IAD to CLT.

ASSISTANT: Sounds good Adams, please provide me your journey dates.

USER: My trip dates are 12/10 and 12/12.

ASSISTANT: Please wait for a minute.

USER: Sure, take your time.

ASSISTANT: There are no flights available at this moment.

USER: Ok, no problem. Thank you for your information.

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