You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Karen Thomas.

ASSISTANT: How may I help you?

USER: I would like to book a flight ticket from LAS To SFO to meet my friends. Could you please help me with booking a flight ticket?

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

USER: My travelling dates are Mar 11 and Mar 13.

ASSISTANT: Is there any requirements regarding your journey?

USER: I want to depart in the evening.

ASSISTANT: Do you prefer any connection limit?

USER: I need a connecting flight.

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

USER: No worries, thank you for the information.

ASSISTANT: Thank you very much for reaching us.