You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I support you?

USER: I have a meeting at Charlotte. I need your help in booking a flight ticket to reach there.

ASSISTANT: Sure, we are mirthful to help you. May I know your depart and arrival dates?

USER: I am glad to know that. March 23 and 25 are my planned depart and arrival dates.

ASSISTANT: Is there any class preference for you?

USER: I am good with any flight.

ASSISTANT: Do you need any flag stop in your journey?

USER: I am ok with or without a break.

ASSISTANT: May I know your airport codes?

USER: IAD and CLT are the respective airport codes.

ASSISTANT: Do you have any other specifications?

USER: Nothing much to state.

ASSISTANT: To proceed further, May I know your good name please?

USER: Kathleen Collins here.

ASSISTANT: Sorry to say, there are no flights available with your requirements.

USER: That's ok. Thank you.

ASSISTANT: Thank you for approaching us.