You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Richard Rodriguez.

ASSISTANT: Richard Rodriguez. How can I help you?

USER: I want to book a economy class flight ticket from Charlotte to St. Paul, can you help me with booking?

ASSISTANT: Sure, can you provide me with the airport codes please.

USER: I will fly from CLT to reach MSP.

ASSISTANT: I would like to have your travel dates.

USER: My trip dates are Aug 10 to Aug 12.

ASSISTANT: Do you have any preferences?

USER: Yes, I need a connecting flight.

ASSISTANT: Give me a moment.

USER: Sure.

ASSISTANT: We are sorry to inform you that, there are no flights on your desired dates.

USER: Ok, no issues.

ASSISTANT: Thank you for approaching us.