You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I help you?

USER: I am Patrick Wilson. I would like to go to shopping in Ferry building market place at San Francisco, which is famous for summer wear. Can you help me?

ASSISTANT: Please help me with your dates?

USER: 03/27 and 03/29 are my travelling dates.

ASSISTANT: May I know your airport codes?

USER: PHL and CLT are my airport codes.

ASSISTANT: Sorry, there is no flight found with your details.

USER: No issue. Thank you.