You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, How can I serve you?

USER: I am planning to attend a Tennis competition in Phoenix PHX from DFW. Can you find a flight ticket for me?

ASSISTANT: Sure, May I know the travelling dates?

USER: Ok, my planned trip dates are on Oct 18 and return on Oct 20.

ASSISTANT: Do you have any connection limit?

USER: I need a single connecting flight.

ASSISTANT: Is there any other requirements?

USER: Yes, I want to return in the morning time.

ASSISTANT: May I know your name?

USER: Yes, I am Joshua Martin.

ASSISTANT: Please wait a minute.

USER: Sure.

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

USER: Ok, no problem. Thank you for your information.

ASSISTANT: Thank you for opting us.