You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you at present?

USER: I am planning to visit Chicago with my family.

ASSISTANT: OK.

USER: Can you help me to book a ticket?

ASSISTANT: Sure, I can help you. May I know your depart and arrival dates to search a flight for you?

USER: My trip dates are 06/18 and 06/20.

ASSISTANT: Ok, help me with your source and destination airport codes?

USER: My airport codes are DEN-ORD.

ASSISTANT: Could you please provide your name?

USER: Carolyn Miller here.

ASSISTANT: Frontier airline plane is available with a fare of 100 on your desired route. Shall I proceed to confirm this flight?

USER: Go ahead.

ASSISTANT: Ok, your booking has been confirmed with 1003 flight.

USER: Thank you so much.

ASSISTANT: Thanks for reaching us, have a nice day.