You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how may I help you?

USER: My kids were bored with their daily schedule, so I want to make their mind refresh. I have decided to take a tour to Los Angeles, CA - LAX. Can you help me in booking my flight ticket?

ASSISTANT: Sure, could you please provide your Source and travel dates?

USER: Ok, My source is from IAD. I want to fly on 03/31 and return on 04/02.

ASSISTANT: Ok, please wait a moment.

USER: Sure.

ASSISTANT: Sorry to say, there are no flights found on your dates.

USER: Ok, no problem.

ASSISTANT: Can you please provide your name for documentation purpose?

USER: I am Charles Collins. Thank you for your information.

ASSISTANT: Ok Charles, your booking is done. Thank you.