You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you now?

USER: Sandra Lopez here.

ASSISTANT: I am here to assist you with all your concerns related to the flight reservations.

USER: I want to travel from LAS to ORD for attending a Seminar. Can you please help me for booking the flight ticket?

ASSISTANT: May I know your planned dates for this journey?

USER: My travelling dates are from 02/26 to 02/28.

ASSISTANT: Ok, please allow me to check with flight availability.

USER: Ok, I will wait.

ASSISTANT: Sorry for the inconvenience, no flights are currently available.

USER: Anyway, thanks for the information.

ASSISTANT: Thank you for choosing our assistance. Have a nice day.