You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Michelle Allen.

ASSISTANT: How may I aid you?

USER: I want to book a ticket from CLT to LAX to attend seminar, can you help me in booking?

ASSISTANT: Sure, I am here to help you out. May I know your travelling dates please?

USER: I am departing on 09/15 and return on 09/17.

ASSISTANT: Wait for a while please.

USER: Sure.

ASSISTANT: Michelle Allen, there are no flights available in your route.

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

ASSISTANT: Thank you for reaching us.