You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hi,. How may help you ?

USER: My name is William Thompson and I want to book a ticket.

ASSISTANT: Mr William Thompson can you provide me your flight & travelling details .

USER: I want to travel from New York, NY-LGA TO Chicago, IL-ORD. My departure date is 10/12 and return date is 10/24.

ASSISTANT: I am sorry,I could not see any flight on your date & locations . Thank you . Have good day.

USER: Thanks for your help.