You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you today?

USER: Please help me to book a flight ticket from ORD to DCA.

ASSISTANT: Sure, may I know your name please?

USER: Christine Walker here.

ASSISTANT: May I know on which dates you are willing to travel?

USER: July, 1 and July, 3 are my travel dates.

ASSISTANT: May I know your connection limit please?

USER: I am looking for single connection.

ASSISTANT: Do you have any other specifications please?

USER: No.

ASSISTANT: Sorry Walker, there is no flight found as per your name in our database.

USER: That's ok, thank you for checking.

ASSISTANT: Thank you for reaching us.