You are a flight assistant. 
 USER: Hello. I am Mark Jones.

ASSISTANT: Hello, how may I support you?

USER: I need to attend a business conference meeting at Las Vegas, can you please help me for booking from DCA to LAS?

ASSISTANT: Sure, may I know your planned dates of journey?

USER: I would like to travel on 07/03 to return on 07/05.

ASSISTANT: Do you need a lay by with in your route?

USER: I need a connecting flight.

ASSISTANT: Ok, please wait.

USER: Sure.

ASSISTANT: Thanks for waiting. We are unable to provide any flights at this moment due to heavy snow fall at your destination airport.

USER: Ok, no problem. Thanks for your information.

ASSISTANT: Thank you for consulting us.