You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you?

USER: I want to book a connecting flight ticket to attend an event from DC. Can you help me?

ASSISTANT: Sure, please share me your travelling dates?

USER: Thank you. 08/05 and 08/07 are my travelling dates.

ASSISTANT: May I know your airport codes?

USER: DCA and CLT are my airport codes.

ASSISTANT: Do you have any class preference?

USER: No.

ASSISTANT: Is there any connection limit?

USER: I have already mentioned it above.

ASSISTANT: May I know your name?

USER: I would like to return in the morning. Helen Roberts.

ASSISTANT: Sorry, there were no flights with your given details.

USER: No issue. Thank you.

ASSISTANT: Thank you for reaching us.