You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you at this moment?

USER: Can you please help me to book a flight in Major Airlines to reach DFW?

ASSISTANT: Sure, could you please provide your take off airport code?

USER: I would like to take off from PHX.

ASSISTANT: Kindly mention your travel dates.

USER: My planned dates are on Oct 20th to 22nd.

ASSISTANT: Do you have any specifications?

USER: I have planned to depart in afternoon time.

ASSISTANT: Please let me know your connection limit?

USER: Yes, I prefer it.

ASSISTANT: May I know your good name to proceed further?

USER: Sure, my name is Justin Martinez.

ASSISTANT: Sorry, there are no flights available as per your requirements.

USER: No problem, thank you.

ASSISTANT: Thank you for opting us.