You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I help you?

USER: Can you please help me in booking a flight ticket from DCA to IAD?

ASSISTANT: Sure, let me know your travel dates please?

USER: My travel dates are from Mar 18th to Mar 20th.

ASSISTANT: May I know your connection limit?

USER: I want a single connection in between my journey.

ASSISTANT: Do you need any other preference?

USER: I want to depart in the morning.

ASSISTANT: Can I know your name please?

USER: I am Carolyn Roberts.

ASSISTANT: Sorry to inform you that there are no flight services available.

USER: Ok, no issues. Thank you.

ASSISTANT: Thank you for contacting us.