You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you?

USER: Can you help me to book a direct flight from SFO?

ASSISTANT: May I know your trip dates?

USER: My travelling dates are 06/24 and 06/26.

ASSISTANT: Please share your destination airport codes?

USER: My preferred destination airport code is PHL.

ASSISTANT: Do you have any requirements?

USER: I need a economy class.

ASSISTANT: Sorry, no flight found on your route.

USER: No issues, thank you for your time.

ASSISTANT: May I know your name?

USER: My name is Pamela Lewis.

ASSISTANT: Thank you.