You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, How can I help you?

USER: Can you please help me to book a flight ticket from PHX to EWR?

ASSISTANT: Sure, May I know the travelling dates?

USER: My travelling dates are May 21 to May 23.

ASSISTANT: Do you have any connection limit?

USER: No.

ASSISTANT: Is there any other requirements?

USER: No more requirements.

ASSISTANT: May I know your name?

USER: Frank Wright.

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

USER: No problem, thank you.

ASSISTANT: Thank you for opting us.