You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I help you?

USER: I am Benjamin Williams. I want to travel to Philadelphia because I heard that it is very famous for Innovation. Can you book a ticket from LAX to PHL?

ASSISTANT: Yes, I can help you with that. Can you specify your travelling dates?

USER: My journey dates are from 03/31 to 04/02.

ASSISTANT: Give me a moment.

USER: Ok.

ASSISTANT: Sorry to inform you that there is no flight found on your requested dates. Thank you for reaching us.

USER: Not a problem. Thank you for your response.