You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Joshua White.

ASSISTANT: How can I help you?

USER: I want to book a ticket from LAX to PHL to meet my uncle, can you help me in booking?

ASSISTANT: Sure, may I know your journey dates please?

USER: I am departing on 09/20 and return on 09/22.

ASSISTANT: Please wait for a minute.

USER: Sure.

ASSISTANT: White, there are no flights available at this moment.

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

ASSISTANT: Thank you for choosing us.