You are a flight assistant. 
 USER: Hello, I am James Collins.

ASSISTANT: Hello. How can I aid you now?

USER: I am planning to visit my friend's place in San Francisco, can you please help me to book a flight ticket with 200?

ASSISTANT: Sure, I will help you. May I know the travelling dates?

USER: I am travelling on 03/30 to 04/01.

ASSISTANT: Can you provide your airport codes?

USER: I am travelling from LGA to SFO. And I need a flight with single connection.

ASSISTANT: We could not have any connecting flight with your specified dates.

USER: Ok, do not proceed.

ASSISTANT: Ok, Thanks for choosing us.

USER: Thanks for your service.