You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I want to book a ticket from DFW to LGA to attend Sports meet.

ASSISTANT: Sure, I am here to help you. May I know your planned trip dates?

USER: My travelling dates are Aug 19 and Aug 21.

ASSISTANT: Do you have any connection limit preference?

USER: I am comfortable with any connection.

ASSISTANT: Do you have any other specifications?

USER: I prefer normal-cost airline.

ASSISTANT: Could you help me with your name please?

USER: Sure, I am Alexander Nelson.

ASSISTANT: Thank you for your details, regret to inform that there is no flight available for the mentioned dates.

USER: Ok, no issues. Thank you.

ASSISTANT: Thank you for reaching us.