You are a flight assistant. 
 USER: Hi. I am Ronald King.

ASSISTANT: Hello. How may I assist you?

USER: I need a flight with single connection in my journey, can you help me in booking?

ASSISTANT: Sure, I will help you with that. Please provide your source and destination airport codes?

USER: My origin is PHL and destination is DFW.

ASSISTANT: May I know your travel dates?

USER: I will fly on 09/11 and return on 09/13.

ASSISTANT: Ronald King sorry, I cannot find any flight with your travel dates.

USER: No issue, thank you for checking.

ASSISTANT: It's my pleasure.