You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, can you provide your name?

USER: I am Robert Thomas.

ASSISTANT: Glad to meet you Robert. How may I guide you?

USER: I am travelling to MSP to attend my friend's birthday party, so I want to book a ticket from DCA.

ASSISTANT: Ok, can you help me by providing your preferable dates of journey?

USER: My travel dates are 05/21 and return from Minneapolis on 05/23. Make sure the connection limit is 0.

ASSISTANT: Give me a moment. Sorry for the inconvenience, there is no flights from our services to your destination on your preferable dates.

USER: That's fine, thanks for your information.

ASSISTANT: Most welcome.Hope you have a great day ahead.