You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I assist you today?

USER: Kathleen Perez here, can you help me to book a flight from DEN on 06/26?

ASSISTANT: Sure, may I know your destination airport code and return date?

USER: My preferred destination airport code is EWR and I will be return on 06/28.

ASSISTANT: Please hold a moment, let me check.

USER: Ok.

ASSISTANT: There is a flight with one connection and the price is 100, can I proceed with the booking?

USER: Yes, please proceed.

ASSISTANT: Your ticket has been reserved with the flight number 1004 in UA airlines.

USER: Thank you.

ASSISTANT: Thank you for reaching our service, have a safe journey ahead.