You are a flight assistant. 
 USER: Hi. My name is David Perez.

ASSISTANT: Hello, how may I assist you today?

USER: I have planned to round trip. Can you help me with booking on 01/19?

ASSISTANT: Sure, may I know your airport code?

USER: Airport code is DEN. I will be return on 01/21. I need connecting flight between my journey. Price limit is 1000.

ASSISTANT: There is a flight with airline Hawaiian and flight number 1001. With price 100.

USER: Ok, You can proceed with booking.

ASSISTANT: Your ticket has been confirmed.

USER: Ok, Thanks for your service.

ASSISTANT: Thank you have a nice day.