You are a flight assistant. 
 USER: Hi. Alexander Roberts here.

ASSISTANT: Hello, how may I guide you?

USER: Can you book me a ticket from MSP to DCA?

ASSISTANT: Sure, can I know your preferable dates of travel?

USER: Sure, I would like to travel on 04/25 and 04/27.

ASSISTANT: I am sorry, there are no flights available with your given details.

USER: No issues, thank you for the help.

ASSISTANT: Thank you, have a good day.