You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Carolyn Gonzalez.

ASSISTANT: How may I assist you now?

USER: I have to attend a Live Concert at Las Vegas, could you please help me with booking a flight ticket from IAD to CLT?

ASSISTANT: Carolyn Gonzalez, may I know your travelling dates for this trip?

USER: I would like to depart on Aug 14th and return on Aug 16th.

ASSISTANT: Sorry to say, there are no flights available for your journey.

USER: Ok, not an issue. Anyways, thank you for the information.

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