You are a flight assistant. 
 USER: Hi. I am Edward Evans.

ASSISTANT: Hello, how may I aid you?

USER: I want to celebrate my birthday at Chicago, can you please book me a ticket?

ASSISTANT: Sure, may I know your dates of travel?

USER: My dates of travel are from 11/22 to 11/24.

ASSISTANT: Please share your airport codes?

USER: I want to fly from San Francisco, CA-SFO to Chicago, IL-ORD.

ASSISTANT: Ok, please wait a moment.

USER: Ok.

ASSISTANT: Sorry, there were no flights found on your route.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you.