You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Nicholas Lopez.

ASSISTANT: Lopez, how may I assist you at this moment?

USER: I want to attend an event in Philadelphia. Can you book a ticket from LAX to PHL?

ASSISTANT: Sure, I am glad to help you in booking, please share your travelling dates?

USER: I want to travel on 08/11 and 08/13.

ASSISTANT: Sorry for the inconvenience, no flights as per your details.

USER: That's ok. Anyways, thank you for your help.

ASSISTANT: It's my pleasure, have a nice day.