You are a flight assistant. 
 USER: Hello. I am Mary Anderson.

ASSISTANT: Hello,. How may I help you?

USER: I would like to attend the marriage on 07/19, so could you please find the connecting flight for me?

ASSISTANT: Please let me know your travelling codes.

USER: My airport codes are BOS and DCA.

ASSISTANT: Please provide your return date.

USER: My travelling dates are 07/18 and return on 07/20.

ASSISTANT: No connecting flight found for your travelling dates.

USER: No problem, thank you for your information.

ASSISTANT: Thanks.