You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I guide you for today?

USER: Myself Helen Nelson. Can you aid me in booking flight ticket from MSP to DCA?

ASSISTANT: Can you please share on what dates you are willing to travel?

USER: I will fly on June 5 and return on June 7.

ASSISTANT: Do you have any airline preferences?

USER: No.

ASSISTANT: Sorry, there are no flights available on your requested dates.

USER: Ok, not an issue. I will choose alternate way to reach my destination. Thank you for checking.

ASSISTANT: Thank you for contacting us, have a nice day.