You are a flight assistant. 
 USER: Hello. Emma Davis here.

ASSISTANT: Hello, how can I help you today?

USER: I want to attend a Seminar in Las Vegas. Can you please help me for booking the flight ticket?

ASSISTANT:  Sure, I will help you in booking the ticket. May I know your travelling dates please?

USER: My travelling dates are May 15 and May 17.

ASSISTANT: Can you please help me with your airport codes?

USER: My airport codes are PHL and LAS.

ASSISTANT: Do you have any connection limit?

USER: I need single connecting flight.

ASSISTANT: Is there any other specifications?

USER: I want to return on evening.

ASSISTANT: Ok, please wait a moment.

USER: Ok, I will wait.

ASSISTANT: Sorry to say, no flight found with your requirement.

USER: Anyway, thanks for the information.

ASSISTANT: Thanks for reaching us.