You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I support you?

USER: I want to reserve my ticket from IAD to LAX to visit Los Angeles, can you please help me in this booking of a ticket?

ASSISTANT: Sure, help me with the trip dates?

USER: Sure, my planned dates of journey are from Jul, 13 to Jul, 15.

ASSISTANT: Let me know your specifications?

USER: Yes, I want a direct flight to fly with it.

ASSISTANT: May I know your name please?

USER: Sure, my name is Larry Mitchell.

ASSISTANT: Sorry, no flights were available in your preferred dates.

USER: Ok, no problem. Anyways, thank you for your service.

ASSISTANT: Thank you for reaching us.