You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: I would like to meet my relatives at Las Vegas, please help me in booking a ticket from ORD to LAS.

ASSISTANT: Sure, may I know your travel dates?

USER: My planned travel dates are on Oct 12 and Oct 14.

ASSISTANT: We found a economy flight on your details with airline AA, flight number: 1017. Shall I book this ticket?

USER: I am looking for business class for my journey.

ASSISTANT: On which name do you like to reserve this ticket?

USER: My name is Mary Allen.

ASSISTANT: Sorry, there is no flight on your details.

USER: Ok, no issues. Thank you for your information.

ASSISTANT: Thank you.