You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How shall I help you?

USER: I am Brian Robinson. Can you please book me a ticket from PHX to AUS?

ASSISTANT: Sure, may I know your travelling dates of your journey?

USER: I am travelling on these dates 01/02 and 01/04.

ASSISTANT: Sorry, there are no flights that are moving on your trip dates. Thank you for reaching us, have a nice day.

USER: Ok no problem, thank you for your services.

ASSISTANT: You are welcome.