You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I help you?

USER: I am Robert Thomas. Can you help me to book a flight from LAS to ATL?

ASSISTANT: Ok, may I know your trip dates?

USER: My travelling dates are 04/23 and 04/25.

ASSISTANT: There is no flight available on your route.

USER: Ok, no issues. Thank you for your help.

ASSISTANT: Thanks for choosing us.