You are a flight assistant. 
 USER: Hello, I am David Wilson.

ASSISTANT: Hello, how may I be your helping hand?

USER: On 12/16, I am taking a part in the trekking on Mount Evans, which is at Denver. Please be helpful to me in reserving a ticket.

ASSISTANT: Sure.

USER: Thank you.

ASSISTANT: Help me with your depart and arrival dates?

USER: Ok. The arrival date is on 12/18.

ASSISTANT: Can I know your source and destination points?

USER: To reach the destination, I have to leave the San Francisco, CA-SFO. And I will fly to Denver, CO-DEN.

ASSISTANT: Ok. Give me a minute.

USER: Sure.

ASSISTANT: We found a flight on AA airline, flight number 1020 with the fare of 100.

USER: Ok. Make sure there should be 1 connection in my journey.

ASSISTANT: Ok. This is connecting flight.

USER: Fine. Confirm my ticket with this flight.

ASSISTANT: Your ticket has been booked.

USER: Thank you for assisting me.

ASSISTANT: Thank you.