You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you today?

USER: I want to travel from PHX to IAH. Can you book a flight ticket for me?

ASSISTANT: Sure, let me know your travelling dates?

USER: I want to travel in the flight on Sept 12 and Sept 14.

ASSISTANT: Do you prefer direct flight or connecting flight?

USER: I want to travel in a connecting flight.

ASSISTANT: Is there any other specifications?

USER: I prefer economy class.

ASSISTANT: Can I know your good name?

USER: Robert Evans.

ASSISTANT: Thanks for your details, there is no flight found on your desired journey routes.

USER: That's ok. Anyways, thank you.

ASSISTANT: Thank you for choosing us.