You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: Melissa Brown here, need your help to book a flight ticket to meet my sister at Chicago. Can you please help me with a connecting light?

ASSISTANT: Sure, may I know your journey dates?

USER: Sure, I need to reserve the ticket on 07/20 and 07/22.

ASSISTANT: Please share me your source and destination codes.

USER: Sure, I will start from JFK and reach ORD.

ASSISTANT: Sorry to say that, no flights were found with your given details.

USER: No problem, thank you.

ASSISTANT: Thank you for opting us.