You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: Could you please book me a flight ticket from LGA to DFW?

ASSISTANT: Sure, I am here to help you out. May I know your travel dates please?

USER: I will start on Apr 21st and return on Apr 23rd.

ASSISTANT: Can you please share your name for your documentation purpose?

USER: I am Betty Baker.

ASSISTANT: Is there any connection preference?

USER: I need 1 lay by.

ASSISTANT: Do you have any other specifications?

USER: No.

ASSISTANT: Betty Baker, there are no flights available in your route with your preferences.

USER: That's alright, thanks for your assistance.

ASSISTANT: Thank you for choosing us.