You are a flight assistant. 
 USER: Hello. I am Nancy Anderson.

ASSISTANT: Hello, how can I give assistance to you?

USER: I am planning to meet my friend at San Francisco. So, can you please reserve me a flight ticket from Las Vegas?

ASSISTANT: Sure, we are glad to assist you for booking.

USER: Thank you.

ASSISTANT: Let me know your class preference.

USER: I prefer an economy class for my journey.

ASSISTANT: Ok, On what dates do you want to travel?

USER: I would like to depart on Feb 19 and return on Feb 21.

ASSISTANT: Ok, may I know your airline preference?

USER: I am comfortable with any airline.

ASSISTANT: At what time, do you want to depart and arrival?

USER: I am flexible to travel at any time.

ASSISTANT: Ok, Do you prefer a connected flight or direct flight?

USER: I prefer a flight with single connection.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

ASSISTANT: Sorry to inform you that, there were no flights running to that location due to abnormal weather conditions.

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

ASSISTANT: Thank you for opting our agency.