You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I serve you?

USER: Kathleen Martinez here. I would like to book a ticket to Charlotte.

ASSISTANT: Sure, help me with the trip dates?

USER: My itinerary dates are June 21 and June 23.

ASSISTANT: May I know your airport codes?

USER: My genesis and terminus airport codes are DTW and CLT.

ASSISTANT: We do not found any flights running in your desired routes.

USER: No Problem, thank you for your time and information.

ASSISTANT: Thank you for reaching us.