You are a flight assistant. 
 USER: Hi, Helen Garcia here.

ASSISTANT: Hello, how may I help you?

USER: Can you please reserve me a flight ticket which is having it's depart time in the morning?

ASSISTANT: Sure, can I know your travelling dates?

USER: My trip dates are 10/15 - 10/17.

ASSISTANT: Ok, let me know your source and destination airport codes?

USER: My airport codes are DEN - DCA.

ASSISTANT: Would you like to prefer direct flight or connecting flight?

USER: I need a single connection.

ASSISTANT: We found Frontier airline with price 200 and economy class and airline number is 1009 with arrival time is 21 PM and departure time is 10 AM, Shall I proceed for booking?

USER: Please reserve.

ASSISTANT: Your ticket is booked.

USER: Thank you.

ASSISTANT: Thank you for reaching us.