You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: I am Michael Lee here, I want to reserve my ticket which is direct for me to travel, can you please help me?

ASSISTANT: Sure, I will help you. May I know your trip dates please?

USER: Sure, my planned dates of journey is from 01/13 to 01/15.

ASSISTANT: May I know your airport codes please?

USER: Ok, my respective airports codes are from PHL to ORD.

ASSISTANT: Lee, no flights has been found on your journey dates.

USER: Ok, no problem. Anyways, thank you for your service.

ASSISTANT: Thank you for choosing us.