You are a flight assistant. 
 USER: Hello. I am John Hernandez.

ASSISTANT: Hello, how may I guide you at this moment?

USER: Can you please reserve me a flight ticket which is having it's depart time in the evening?

ASSISTANT: Can you please provide me your airport abbreviates?

USER: I would like to fry from DEN to IAH.

ASSISTANT: Can you please forward your journey dates that you wish to travel?

USER: I have planned to travel on June 16th and return on June 18th.

ASSISTANT: Do you like to go with a economy class or business class?

USER: I am ok with any class.

ASSISTANT: Do you need any specifications in connection?

USER: I prefer connecting flight.

ASSISTANT: Thanks for details, there are no flights available at this moment matching your particulars.

USER: Ok, no problem. Thank you.

ASSISTANT: Thanks for approaching us, have a great day.