You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I serve you?

USER: Can you help me to book a connecting flight on June 18?

ASSISTANT: Sure. Please share me your airport codes.

USER: My airport codes are ORD and DTW.

ASSISTANT: May I know your name?

USER: My name is Mary Clark.

ASSISTANT: When would you like to return?

USER: I would like to return on June 20.

ASSISTANT: Is there any other specifications?

USER: No.

ASSISTANT: We found a connecting flight with an Frontier airline, flight number:1026.

USER: Proceed with booking.

ASSISTANT: Your flight ticket has been reserved with an economy class.

USER: Thank you.

ASSISTANT: Thank you for reaching us.