You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you?

USER: I am Shirley Johnson. Could you please help me with finding a flight ticket on the route LAS to SFO?

ASSISTANT: Sure, may I know your trip dates?

USER: I would like to take off on 10/19 and return on 10/21.

ASSISTANT: Sorry, there is no flight on your given dates.

USER: That's ok, no issues.

ASSISTANT: Thank you for reaching us.

USER: Anyways, thank you for the information.