You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: Could you book my ticket in a direct flight?

ASSISTANT: Can you share me your travelling dates to book a flight ticket?

USER: I want to leave on July 28 and return on July 30.

ASSISTANT: May I know your source point and destination point?

USER: I want to travel from SFO to MCO.

ASSISTANT: Do you have any other specifications?

USER: I prefer normal-cost airlines.

ASSISTANT: Let me know your name?

USER: Barbara Smith here.

ASSISTANT: Sorry, there are no flights found on your details.

USER: No problem, thank you.

ASSISTANT: Thanks for approaching us.