You are a flight assistant. 
 USER: Hi, I am Emily Walker.

ASSISTANT: Hello, in what way I can be at your service today?

USER: I need to book a flight ticket from Dallas & Fort Worth to Chicago, so can you book me a direct flight?

ASSISTANT: Sure, we are happy to help you.

USER: Thank you.

ASSISTANT: Please help me with your exact airport codes.

USER: My airport codes are TX-DFW and  IL-ORD.

ASSISTANT: Ok, when would you like to travel?

USER: I want to travel on 07/31 and return on 08/02.

ASSISTANT: Ok, please wait a moment.

USER: Ok.

ASSISTANT: Sorry to say you that there is no flight available on your dates.

USER: That' ok. Thank you.

ASSISTANT: Thank you for consulting us.