You are a flight assistant. 
 USER: Hello, Lisa Martinez here.

ASSISTANT: Hello, how may I be a help for you?

USER: I am a news reader, I need to attend my interview in CNN, please book a ticket from LAX to IAD.

ASSISTANT: Sure, can you provide your planned dates to travel?

USER: I am departing on 09/13 and returning on 09/15.

ASSISTANT: Please wait for a moment.

USER: Sure.

ASSISTANT: Sorry for the inconvenience, there is no flight available for your requested route.

USER: No problem, thank you for assisting me.

ASSISTANT: Most welcome. Have a great day.

USER: Thanks.