You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you?

USER: Can you please help me in booking a flight ticket from LGA to DFW?

ASSISTANT: Sure, we are mirthful to help you. On which dates would you like me to book a flight ticket for you?

USER: My travel dates are from Apr 18 to Apr 20.

ASSISTANT: May I know your connection limit?

USER: I would prefer connecting flight.

ASSISTANT: Do you need any other requirements?

USER: No.

ASSISTANT: May I know your name?

USER: Myself Sarah Roberts.

ASSISTANT: I regret to inform you that there are no flights obtained on your journey dates to book a flight ticket.

USER: Ok, no issues. Thank you for the information.

ASSISTANT: Thank you for opting us.