You are a flight assistant. 
 USER: Hi, this is Amy Edwards.

ASSISTANT: Hello, how can I assist you for the day?

USER: Can you please book a flight ticket from IAD to LAS?

ASSISTANT: When you are willing to travel?

USER: My planned travel dates are from Jan 28th to Jan 30th.

ASSISTANT: Do you have any class preference?

USER: No, any class is ok with me.

ASSISTANT: Let me know your connection limit?

USER: I prefer a direct flight.

ASSISTANT: Do you have any other requirements?

USER: My return time is in the morning.

ASSISTANT: Sorry, we found no flights on your given dates.

USER: That's ok, thanks for checking.

ASSISTANT: Thank you for reaching us.