You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, How can I assist you?

USER: Margaret Gonzalez here. I want to attend a seminar on automation, could you book my ticket from PHX to DEN?

ASSISTANT: Sure, May I know the trip dates?

USER: My itinerary dates are Sept 17 and Sept 19.

ASSISTANT: Do you have any connection limit?

USER: No.

ASSISTANT: Do you have any airline preference?

USER: I have no other preferences.

ASSISTANT: Is there any other requirements?

USER: No.

ASSISTANT: Please wait a minute.

USER: Sure.

ASSISTANT: Sorry, No flights found with your chosen dates.

USER: No problem, thank you.

ASSISTANT: Thank you for availing us.