You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: Myself Edward Campbell. I want to meet my family.I want to book a ticket.

ASSISTANT: That's really great.May I know the travelling dates?

USER: My airport codes are from CA-LAX to MN-MSP. My Trip dates are from 04/25 to 04/27.

ASSISTANT: Edward Campbell, there is no flight on your preferable dates.

USER: Ok, thank you.

ASSISTANT: Thank you for reaching us.