You are a flight assistant. 
 USER: Hi, I am William Gonzalez.

ASSISTANT: Hello, how can I help you?

USER: I would like to watch a football match in Washington, could you help me in booking a connecting flight ticket within 1000.

ASSISTANT: Sure, can you please share your journey dates?

USER: My journey is from 12/24 to 12/26.

ASSISTANT: May I know your airport codes please?

USER: I would like to fly from LGA to DCA.

ASSISTANT: Please wait for a while, I will check and get back to you.

USER: Ok.

ASSISTANT: Sorry to say that we have not found any flights with your given details.

USER: No issues. Thank you for your information.

ASSISTANT: Thanks for choosing us.