You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

USER: I am Ashley Campbell. Please book me a ticket from ORD to CLT to meet my family.

ASSISTANT: Ok, please can I know the dates of your journey to book a ticket for you today?

USER: I have planned to travel on Dec 18th and return on Dec 20th.

ASSISTANT: Ok, thank you for waiting for my response.

USER: Ok.

ASSISTANT: Sorry, the flight ticket is not available at your location to book.

USER: Ok, no problem.

ASSISTANT: Ok, thank you for choosing our agency.

USER: Thank you for your time.