You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: Gregory Mitchell this side, I want to give an interview at the company located at Chicago. Can you help me to book a ticket?

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

USER: I am planning to start my journey on 01/11 and return on 01/13.

ASSISTANT: Ok, can you please provide your airport codes?

USER: My source and airport codes are CLT and ORD respectively.

ASSISTANT: Ok, hold on for a moment.

USER: Sure.

ASSISTANT: Sorry Gregory, there are no flight available on your requested dates. Sorry for the inconvenience provided.

USER: No issues. I will reach by other means of transport.

ASSISTANT: Sure, thank you for reaching us. Have a good day.

USER: You are welcome. Thank you for your help.