You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: Can you please guide me in booking my flight ticket from JFK to SFO?

ASSISTANT: Sure, I am here to help you for this. Could you please share me your travel dates?

USER: I am planning to start on Sep 23rd and my return date is on Sep 25th.

ASSISTANT: Is there any other specifications regarding your journey?

USER: My return flight should be in the evening.

ASSISTANT: Do you have any other requirements?

USER: I prefer a connecting flight.

ASSISTANT: May I know your name please?

USER: I am Melissa Collins.

ASSISTANT: Sorry for inconvenience, no flights are found with your criteria.

USER: Its ok, thank you.

ASSISTANT: Thank you very much for contacting our agency.