You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello,. How may I address you?

USER: I need a direct flight to Las Angeles, to visit my old friends. Can you please book me a flight ticket with in fare of 1000?

ASSISTANT: Sure, can you provide your journey dates?

USER: My preferable dates are 05/29 is departure and return on 05/31.

ASSISTANT: May I know your airport codes?

USER: Sure, source is at San Francisco, CA - SFO and destination is NV - LAS.

ASSISTANT: Sorry to inform that there is no flight found with your requirements.

USER: That's not a problem.

ASSISTANT: May I know your good name?

USER: Thanks for your information. Matthew Wright is my name.

ASSISTANT: Thank you.