You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Donna Martinez.

ASSISTANT: Donna Martinez, how may I assist you with today?

USER: I am planning to visit Los Angeles LAX from IAD. Can you find a flight ticket for me?

ASSISTANT: Sure, I will help you.

USER: Thank you.

ASSISTANT: Please help me with your planned travel dates.

USER: Ok, my planned trip dates are on Sept 12 and return on Sept 14.

ASSISTANT: Donna Martinez, do you need a direct or connecting flight?

USER: Yes, I need a single connecting flight.

ASSISTANT: Do you have any other preferences please?

USER: I want to depart in the evening.

ASSISTANT:  I am sorry to inform you that there are no flights available that depart in the evening.

USER: Ok, not an issue. Thank you for your information.

ASSISTANT: Thank you for reaching us. Have a great time.