You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Joshua Allen.

ASSISTANT: How can I assist you today?

USER: I have planned for the trip to Chicago, can you please help me in searching a flight from Orlando?

ASSISTANT: Sure, will you mention your travelling dates please?

USER: Thank you. My preferable travel dates are 02/20 and 02/22.

ASSISTANT: Please provide your airport codes that you want to travel.

USER: The airport codes which are nearer to my desired locations are MCO and ORD.

ASSISTANT: Please give me a moment.

USER: Ok, take your time.

ASSISTANT: Thanks for waiting, there is no flights found under your preferable details.

USER: It's ok, not a problem with that. I will choose some other source to travel. Thank you for checking the flight availability.

ASSISTANT: Welcome, have a great day.