You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I aid you?

USER: I am Dorothy Harris here, I would like to travel from ORD to PHL, can you please help me to book a ticket?

ASSISTANT: Sure, I am here to help you out. Please share me your trip dates.

USER: Sure, my preferable dates of trip is from 08/05 to 08/07.

ASSISTANT: Sorry Harris, there is no flight in your route with your dates.

USER: ok, no problem. Thank you for your appreciable service.

ASSISTANT: Thank you for reaching us.