You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you now?

USER: I would like to travel from DFW to DEN for business meeting, can you please book the flight ticket?

ASSISTANT: Please provide me your travel dates to proceed further.

USER: I will depart on 12/27 and return on 12/29.

ASSISTANT: May I know you name please?

USER: My name is Kathleen Garcia.

ASSISTANT: Sorry Garcia, no flight is available.

USER: No problem, thank you for checking.

ASSISTANT: Most welcome, have a nice day.