You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: My name is Robert Taylor.

ASSISTANT: How may I assist you?

USER: I have to attend my business meeting at Las Vegas, can you help me to book a direct flight?

ASSISTANT: Ok, may I know your airport codes?

USER: Sure, I want to fly from EWR to LAS.

ASSISTANT: Your trip dates please.

USER: Yes, my travelling dates will be 03/04 and 03/06.

ASSISTANT: There is no flights available on these dates.

USER: That's ok, thank you.

ASSISTANT: You are welcome.