You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: I am Sharon Allen, can you help me to book a flight ticket from CLT to ORD?

ASSISTANT: Sure, can you please provide me your trip dates?

USER: Ok, my depart date is 05/14 and 05/16 is return date.

ASSISTANT: Ok, please be on hold for a moment.

USER: Ok.

ASSISTANT: Sorry Allen, there are no flights available on your given dates.

USER: That's ok, no problem I will book next time. Thank you for assisting me.

ASSISTANT: Thank you for choosing us and have a nice day.