You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I aid you today?

USER: I am Charles Johnson here, I want to reserve my ticket from PHL to BOS, can you please help me?

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

USER: Sure, my dates of travel are from 07/15 to 07/17.

ASSISTANT: Please wait a moment.

USER: Sure, I will wait.

ASSISTANT: Sorry Charles Johnson, there is no flight in your route with your travel dates.

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

ASSISTANT: Thank you for reaching us.