You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you today?

USER: I am looking for a flight from Washington to meet my brother, who lives at Chicago. Can you help me with booking?

ASSISTANT: Sure, may I know your planned travel dates?

USER: I will travel on Mar 2nd and return on Mar 4th.

ASSISTANT: Thank you, can you confirm me your nearest airport codes please?

USER: My source point is DCA and my destination is ORD.

ASSISTANT: Do you have any limit on number of connections?

USER: I would prefer single connection.

ASSISTANT: May I know any another specifications on your journey ?

USER: I do not have any other specifications.

ASSISTANT: Please confirm your good name for the booking process?

USER: My name is Karen Thomas.

ASSISTANT: Sorry Thomas, we regret to inform you that there is no flight available as per your specified dates.

USER: Ok, thank you for the details.

ASSISTANT: Welcome, thank you for reaching us.