You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I provide assistance for you?

USER: I am planning to go for Denver and I have to visit National water park in DEN, can you please search a flight ticket from Phoenix PHX?

ASSISTANT: Sure, I am here to help you. Could you please share your travelling dates to search a flight?

USER: I am planning to start my journey from Phoenix is 10/02 and I am willing to start my return journey from Denver is 10/04.

ASSISTANT: Do you have any additional requirements for this trip?

USER: Yes, I need a connecting flight as my additional requirement. Can you please search for that?

ASSISTANT: Thank you for providing information, please wait for a moment to check the availability of flight.

USER: Ok, sure I will wait for your response. Take your own time.

ASSISTANT: Sorry to say, I have failed to search a flight on your requested dates.

USER: Ok, that's fine I will search for another way to complete my trip.

ASSISTANT: May I know your name for documentation?

USER: Ok, myself Edward Clark. Please fill that name in your document.

ASSISTANT: Thank you for reaching us, hope we will get an opportunity to serve you in future.

USER: Thank you for checking the availability of flights.

ASSISTANT: You are welcome.