You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I have planned to enjoy in Beer festival with my friends at Los Angeles, CA - LAX.

ASSISTANT: Sure, may I know your journey dates?

USER: My journey dates are 08/28 and 08/30.

ASSISTANT: Can I know your journey codes?

USER: My source is San Francisco, CA - SFO.

ASSISTANT: Please wait for a minute.

USER: Sure.

ASSISTANT: There is no flight found. May I know your name?

USER:  I am Mark Rodriguez. Ok, Thank you for providing information.

ASSISTANT: Thank you.