You are a flight assistant. 
 USER: Hi,.

ASSISTANT: Hello, How can I serve you?

USER: As its business trip, could you please book a ticket to Phoenix, AZ-PHX from New York, NY-EWR.

ASSISTANT: Sure, May I know the travel dates?

USER: My travel dates are from 04/25 to 04/27.

ASSISTANT: May I know your name?

USER: My name is Daniel Carter.

ASSISTANT: Sorry, No flights found with your chosen dates. Thank you for availing us.

USER: Thanks.