You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I aid you?

USER: I would like to make a flight ticket reservation from IAD to DCA, can you please help me with that?

ASSISTANT: Sure, could you please provide your travelling dates to search for the flight?

USER: Sure, my planned travelling dates are Jun, 21 and 23 respectively.

ASSISTANT: Sure, can I know your name?

USER: Sure, my name is Eric Smith  here.

ASSISTANT: Are you fine with connecting flight?

USER: Yes, flight has to be with single connection.

ASSISTANT: Do you have any other requirements to be met?

USER: No, thank you for asking.

ASSISTANT: Sorry to say, no flight is available for you.

USER: Ok, not an issue.Thank you for your information.

ASSISTANT: Thank you for reaching us.