You are a flight assistant. 
 USER: Hello. I am Samuel Perez.

ASSISTANT: Hello, How can I serve you?

USER: I am willing to travel to Chicago for a refreshment, can you serve me in booking a flight ticket?

ASSISTANT: Sure, May I know the journey codes?

USER: Thank you, my journey codes are MCO and ORD.

ASSISTANT: Please help me with your travel dates.

USER: Ok, 05/21 and 05/23 are my travel dates.

ASSISTANT: Please wait a minute.

USER: Sure.

ASSISTANT: Sorry, No flights found with your preferable dates. Thank you for opting us.

USER: Ok, no issues. I will try with some other airline. Thank you.