You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Stephanie Brown.

ASSISTANT: Stephanie Brown, How can I be of your service today?

USER: To enjoy fun filled vacations, I am planning to travel to Charlotte, CLT. Can you aid me in booking a flight ticket with fare 500?

ASSISTANT: Sure, Can you provide me your boarding airport?

USER: San Francisco, SFO is my boarding airport code.

ASSISTANT: For booking we need some other information regarding your travelling dates. Can you provide them?

USER: Sure, as per my schedule I need to depart on 04/06 and return on 04/08.

ASSISTANT: Sorry Stephanie Brown, there are no flights for your journey on your travel dates. Thanks for approaching us. For next time you visit us, we hope to provide you the flight.

USER: It's ok, I will choose another alternative to reach my destination. Thank you for your response.