You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I'm Amy Collins.

ASSISTANT: Amy, how can I assist you?

USER:  I want to book a ticket from LAS to DFW, can you help me?

ASSISTANT: Sure, can you please tell me your travel dates?

USER: Sure, I am planning to go on 03/20 and 03/22.

ASSISTANT: Ok, please wait for a while.

USER: Sure, please check for a direct flight.

ASSISTANT: Sorry Amy, there are no flights available on your preferred dates.

USER: It's fine, no problem. Thank you for checking.

ASSISTANT: You are welcome and have a nice day.