You are a flight assistant. 
 USER: Hello, Karen Gonzalez here.

ASSISTANT: Hello, how may I help you?

USER: I planned to attend for a wedding in EWR, can you please help me to book a flight ticket?

ASSISTANT: Sure, may I know your travelling dates?

USER: I would like to start on 04/02.

ASSISTANT: Sure, may I know your origin airport code?

USER: I planned to start my journey from DFW.

ASSISTANT: Sure, may I know your return journey date?

USER: I prefer to return back on 04/04.

ASSISTANT: Sorry, no flights on your travel dates. Thank you for choosing us.

USER: You are most welcome.