You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I help you?

USER: I want to book a flight ticket from MN to meet my old friend to start a new business in DC, could you please help me to book a flight ticket with single connection?

ASSISTANT: Sure, may I know your planned trip dates please?

USER: I intend to start on Sept 14th and my return date will be on Sept 16th.

ASSISTANT: Can you please share me your airport codes?

USER: My boarding and landing airport codes are MSP and IAD.

ASSISTANT: Do you have any other requirements?

USER: No I don't have any other requirements.

ASSISTANT: Unfortunately there is no flight found with your given information.

USER: That's ok, I'll choose any alternative to reach my destination. Thank you for your information.

ASSISTANT: May I know your name please?

USER: I am Donna Mitchell.

ASSISTANT: Thank you.