You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

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

ASSISTANT: Sure, may I know your trip dates please?

USER: Sure, my travel dates are from Mar 22 to Mar 24.

ASSISTANT: Do you have any other requirements?

USER: I would prefer economy class for my trip.

ASSISTANT: Ok, can I know your name please?

USER: Myself Sarah Hill.

ASSISTANT: Thank you for waiting and we have found a flight in economy class with 1 connection in Delta airlines and the fare of your flight will be 100. Do you like me to proceed your booking with this flight?

USER: Please make sure that, I need to depart in the morning.

ASSISTANT: Sorry, we regret to inform you that there is no flight available as per your request.

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

ASSISTANT: Most welcome.