You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: I am Melissa Thompson.

ASSISTANT: Ok.

USER: I want to book a flight ticket from CA - SFO to NY - LGA, can you help me in booking a flight ticket?

ASSISTANT:  Sure, kindly assign your travel dates?

USER: My departure day is 08/08, return day is 08/10.

ASSISTANT: Ok, do you prefer any connections?

USER: Yes, I need a connecting flight.

ASSISTANT: Sorry, there are no flights avaialble for your journey, at this moment.

USER: No problem, thank you.

ASSISTANT: Thank you for reaching us.