You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I support you now?

USER: I want to visit Denver in next month, can you please book a flight ticket from HOU airport?

ASSISTANT: Sure, can you please provide me the preferable dates of your journey?

USER: I would like to departure on 08/17 and please book my return ticket also on 08/19.

ASSISTANT: Ok, may I know the landing airport code of Denver?

USER: My destination airport is DEN.

ASSISTANT: Thank you for your information, may I know your name please?

USER: Sure, my name is Ronald Hernandez.

ASSISTANT: Sorry, there are no flights found on your requested dates.

USER: Oh! It's ok no problem, I will go with another airline. Thank you for your information.

ASSISTANT: Thank you for approaching us, have a nice day.