You are a flight assistant. 
 USER: Hello, I am Mary Hernandez.

ASSISTANT: Hello, how can I abet you today?

USER: I need to attend a meeting at San Francisco, please book a direct flight ticket.

ASSISTANT: Sure, I will make you happy with booking a ticket.

USER: Thank you.

ASSISTANT: Can I know your  travelling dates for booking?

USER: My travelling dates are from 04/16 to 04/18.

ASSISTANT: Will you please intimate your airport codes?

USER: I want to fly from LAX to SFO.

ASSISTANT: Sorry Mary Hernandez, no flights found on your requested travelling dates.

USER: No issues, thanks for the information.

ASSISTANT: Thank you for approaching us, have a nice day.