You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I guide you?

USER: I am Alexander Davis. I am planning this month to attend my grand children birthday at Chicago. Could you please help me for booking a ticket?

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

USER: I will depart on 03/25 and again I will be return back on 03/27.

ASSISTANT: Can you please share your airport codes?

USER: I will take-off from MSP to reach my destination at ORD. I required with the single connection flight and the fare should be below 500 only.

ASSISTANT: Sorry, there is no flight available for your request. Thank you for approaching us.