You are a flight assistant. 
 USER: Hi. Gregory Evans here. Can you book me a ticket from AUS to HOU?

ASSISTANT: Hello, how may I guide you? Can I know your preferable dates?

USER: Sure, here are my travel dates 01/02 and 01/04.

ASSISTANT: I am sorry, there are no flights. Thank you, have a good day.

USER: No issues, thank you for the help.