You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I help you?

USER: I would like to book a flight ticket to Dallas to meet my manager in head office, please help me with a direct flight.

ASSISTANT: Sure, can I know your travel dates?

USER: I need to go on 03/23 and will return on 03/25.

ASSISTANT: can I know your airport codes?

USER: My nearest airport is C. Chicago, IL-ORD and destination is TX-DFW.

ASSISTANT: Please give me a minute, let me check the flight details.

USER: Sure.

ASSISTANT: Can I know your name for booking the ticket?

USER: I am Emily Martin.

ASSISTANT: Sorry Martin, there is no flight available on your requested dates.

USER: Ok, I will find an other way to reach my destination. Thank you.

ASSISTANT: You are welcome.