You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, How can I assist you?

USER: I am Frank Walker. I would like to fly from Chicago IL-ORD, for shopping with my granny. Can you please book a connecting flight?

ASSISTANT: Sure, May I know the source code?

USER: My source code is IL-ORD.

ASSISTANT: Sorry, May I know destination code?

USER: My destination code is NV-LAS.

ASSISTANT: Please help me with your travel dates.

USER: My departure and arrival dates are 12/20 and 12/22.

ASSISTANT: Please wait a minute.

USER: Sure.

ASSISTANT: Sorry, No flights found with your dates.

USER: Ok, not an issue. Thank you.

ASSISTANT: Thank you for opting us.