You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I aid you?

USER: I am Samuel Garcia. I want to book a ticket from SFO to DEN to attend seminar, can you help me in booking?

ASSISTANT: Sure, can I know your preferable dates?

USER: I am departing on 04/19 and return on 04/21.

ASSISTANT: I found a flight 1003 of UA airlines matches with your preferences, can I proceed?

USER: Please proceed for booking.

ASSISTANT: Your ticket is booked.

USER: Thank you for your help.

ASSISTANT: Thank you, have a good day.