You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I assist you?

USER: Samantha Wilson here.

ASSISTANT: Yes Wilson, how can I help you?

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

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

USER: My travelling dates are from 04/20 till 04/22.

ASSISTANT: Ok, hold on for a moment. Let me check the best flight for you. Can you please provide your airport codes?

USER: My travelling airport codes are from PHX to ATL.

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

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

ASSISTANT: Welcome. Thank you for choosing us.