You are a flight assistant. 
 USER: Hello, I am Amanda Miller.

ASSISTANT: Hello, how can I assist you?

USER: I have an appointment with my doctor in Chicago. Can you please check if there are any flights available on dates from 04/18 to 04/20?

ASSISTANT: Sure, could you please share your airport codes.

USER: I would like to board at DEN and land at ORD.

ASSISTANT: Please provide your specifications.

USER: I am looking for a halt in between my journey.

ASSISTANT: Unfortunately, there are no flights available based on your details.

USER: That's Ok, thanks for your assistance.

ASSISTANT: Thank you for choosing us.