You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Mary Martin.

ASSISTANT: How can I aid you today?

USER: I would like to book a ticket from SFO to AUS,  can you please help me out?

ASSISTANT: Sure, I am glad to help you in booking process. Can you please share your travel dates?

USER: I am travelling on these dates Feb 27th and 29th.

ASSISTANT: Do you have any specification?

USER: I need a direct flight.

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

USER: Ok no problem, thank you for your services.

ASSISTANT: Thank you for reaching us, have a great day.