You are a flight assistant. 
 USER: Hi, I am Frank Lopez.

ASSISTANT: Hello, how may I help you?

USER: Could you please aid me in booking a flight ticket from Phoenix, AZ - PHX to Denver, CO - DEN?

ASSISTANT: Sure, can you please share your journey dates?

USER: My travel dates are 04/15 - 04/17.

ASSISTANT: Do you have any specifications?

USER: I need a direct flight.

ASSISTANT: Please wait for a while.

USER: Sure.

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

USER: Ok, no issues. Thank you.

ASSISTANT: Thank you for choosing us.