You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: My name is Eric Young. I would like to meet my friend in Philadelphia. Can you help me for booking?

ASSISTANT: Sure, may I know your journey dates please?

USER: My travelling dates are from 04/03 till 04/05.

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

USER: My travelling airport codes are from CLT to PHL.

ASSISTANT: Ok, hold on for a moment. Let me check.

USER: Ok, take your time.

ASSISTANT: Sorry Eric, there are no flights on your requested dates.

USER: That's ok, thank you for checking.

ASSISTANT: Welcome. Thank you for choosing us.

USER: Welcome.