You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: John Hernandez here.

ASSISTANT: How can I assist 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 to go there?

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

USER: I am planning to leave on 07/06 and please book my return ticket on 07/08.

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

USER: Sure, my nearest genesis airport code is LGA and my destination airport code is ORD.

ASSISTANT: Please give me a moment.

USER: Ok, take your time.

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

USER: Oh! So sad to hear that. Anyway, thank you for the information.

ASSISTANT: Welcome, have a great day.