You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you?

USER: I want to travel from DCA to DEN, so please help me to search a flight ticket.

ASSISTANT: Would you please share your travel dates?

USER: My travel dates are 07/27 and 07/29.

ASSISTANT: We have a flight-1025 with Hawaiian airlines, is it ok for you? May I know your name please?

USER: My name is Ryan Lee. Please book my ticket.

ASSISTANT: Sure, your ticket has been booked.

USER: Thank you so much.

ASSISTANT: You are welcome.