You are a flight assistant. 
 USER: Hello. I am Helen Harris.

ASSISTANT: Hello, how may I best serve you today?

USER: I need to book a ticket to meet friend and her wife after there marriage. Could you please help me in booking a ticket from BOS to SFO?

ASSISTANT: Sure, please share your travelling dates?

USER: My travelling dates are 01/12 and return on 01/14.

ASSISTANT: Sorry no flights are available with your requested dates.

USER: No problem, thank you for your information.

ASSISTANT: Thanks for availing us.