You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. What can I do for you?

USER: I'm Helen Harris.I am planning to travel from SFO to LAS for a business meeting. Can you please help me with booking a flight ticket?

ASSISTANT: Could you please tell your travelling dates for flight ticket reservation?

USER: Sure, my departure date is on 05/19 and the return date is on 05/21. Please make sure that the connection limit should be 1.

ASSISTANT: Sure, please wait a moment.

USER: Sure.

ASSISTANT: Sorry to inform you Helen Harris no flights found as per you requested dates.

USER: Ok, no problem. Thank you for the information.

ASSISTANT: You are welcome.