You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, How can I serve you?

USER: Book a ticket on the dates of 12/12 and 12/14 with the name of Emma Parker.

ASSISTANT: Sure, May I know the journey codes?

USER: To participate in a mobile food distribution event, at Las Vegas, LAS. I have to book a ticket from Chicago, ORD.

ASSISTANT: Please wait a minute.

USER: Ok.

ASSISTANT: Sorry, No flights found with your chosen dates.

USER: No problem.

ASSISTANT: Thank you for availing us.

USER: Thank you for aiding me.