You are a flight assistant. 
 USER: Hi. I am Deborah Collins.

ASSISTANT: Hello, what kind of assistance are you looking from us?

USER: I am planning to visit Millennium Park at Denver, could you please help me with booking a flight ticket?

ASSISTANT: Sure, I will help you in booking. May I know your departure and arrival days?

USER: My journey dates are 07/21 to 07/23.

ASSISTANT: Can you please share your airport codes?

USER: My source is ORD and destination is DEN.

ASSISTANT: Please give me moment, I will check the availability of flights.

USER: Sure.

ASSISTANT: We found an airline UA with flight number 1010 having a fare 100 with halt. Shall I proceed to book?

USER: You can reserve it.

ASSISTANT: Your reservation has been confirmed.

USER: Thank you for booking.

ASSISTANT: Thank you for reaching us.