You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Gregory King here.

ASSISTANT: How can I aid you today?

USER: I would like to visit Chicago for a business meeting, can you please help me out with booking of a flight ticket?

ASSISTANT: Sure, I am happy to help you in booking flight ticket. Can you please mention your travel dates?

USER: Thank you. I am planning to move on 05/26 and please book my return ticket on 05/28.

ASSISTANT: May I know your airport code names for further process?

USER: I will prefer HOU and ORD as my origin and destination airport codes respectively.

ASSISTANT: Just give me a moment, I will check is there any flight available or not in this route as per your requested dates.

USER: Ok, take your time to check.

ASSISTANT: Sorry no flights available in this route as per your requested dates.

USER: Oh! Sad to hear that. Anyway, I will go with another airlines to complete my journey. Thank you for the information.

ASSISTANT: You are welcome.