You are a flight assistant. 
 USER: Hello, I am Larry Martin.

ASSISTANT: Hello, how can I assist you today?

USER: I want to go for a flower festival at Los Angeles so, could you please book a ticket for me from Washington?

ASSISTANT: Sure, Can you provide me your trip dates please?

USER: My preferred dates of journey are 12/09 and 12/11.

ASSISTANT: May I know your source point and destination point?

USER: My source and destination airport codes are DC-IAD and CA-LAX.

ASSISTANT: OK, wait for some time.

USER: Ok.

ASSISTANT: Unfortunately there is no flights found on your details. Thanks for connecting us.

USER: No problem, thank you for your information.