You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you?

USER: Could you please check the flight availability in normal cost airline?

ASSISTANT: Sure, we are happy to help you. Can I have your travelling dates?

USER: My travelling dates are Feb 01 and Feb 03.

ASSISTANT: Please help me with your respective airport codes.

USER: I am heading to SFO from BOS.

ASSISTANT: Do you prefer any stopover in between journey?

USER: I need a direct flight.

ASSISTANT: Are there any other specifications for you?

USER: I prefer an economy class.

ASSISTANT: May I know your good name?

USER: My name is Melissa Allen.

ASSISTANT: Sorry, no flights are available on your journey dates.

USER: Not a problem, thank you for the information.

ASSISTANT: Thank you for choosing us.