You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you?

USER: I would like to book a ticket from DEN to PHX, can you please help me out?

ASSISTANT: Sure, may I know the planned travel dates?

USER: I am travelling on these dates Aug 12th and 14th.

ASSISTANT: Please provide me the specifications.

USER: I need direct flight.

ASSISTANT: May I know the name?

USER: Jonathan Gonzalez here.

ASSISTANT: Do you have any specifications?

USER: I prefer normal-cost airlines.

ASSISTANT: Sorry, there are no flights are available for your desired intent.

USER: Ok no problem, thank you for your services.

ASSISTANT: Thank you for reaching us.