You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I be your helping hand today?

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

ASSISTANT: Sure, provide me your travelling dates.

USER: Ok, my planned trip dates are on Nov 27 and return on Nov 29.

ASSISTANT: May I know your name?

USER: Yes, I am Sarah Taylor.

ASSISTANT: Any connection limit required.

USER: Ok, I need a single connecting flight.

ASSISTANT: Any other specifications required for your journey?

USER: No, I don't have any other requirements.

ASSISTANT: Ok, please wait a moment.

USER: Sure.

ASSISTANT: Sorry Sarah Taylor, based on your required specifications we haven't found any flights in airline database.

USER: Ok, not an problem. Thank you for your information.

ASSISTANT: Thanks for contacting us.