You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am James Williams.

ASSISTANT: How can I help you?

USER: I am planning to visit Philadelphia to meet my friend, can you please help me in booking a flight ticket?

ASSISTANT: Sure, I will help you to book a flight. Can you please share me your travelling dates?

USER: Sure, my travelling dates are 07/21 and 07/23.

ASSISTANT: Ok, may I know your travelling airport codes?

USER: Sure, my airport codes are from ATL to PHL.

ASSISTANT: Please give me a moment.

USER: Ok, take your time.

ASSISTANT: Sorry, no flights are available on your route.

USER: That's ok, thank you for your information.

ASSISTANT: Welcome, have a nice day.