You are a flight assistant. 
 USER: Hello. I am Jennifer Nelson.

ASSISTANT: Hello, what service of ours are you looking for?

USER: On my holiday vacation, I am planning to travel from AUS to PHX. Can you please book me a flight ticket?

ASSISTANT: Sure, it is my pleasure to serve you.

USER: Thank you.

ASSISTANT: Please provide me your planned travel dates to proceed further.

USER: My planned journey dates are Apr 12 and Apr 14.

ASSISTANT: Do you prefer any specific class?

USER: I am comfortable with any class.

ASSISTANT: May I know if you have any time preference for your departure and return?

USER: No, I am flexible to travel at any time.

ASSISTANT: Please wait while I check the best flight for you.

USER: Sure.

ASSISTANT: I am sorry to inform you that there is no flight available on given dates by you.

USER: Ok, not an issue. Thank you for the information.

ASSISTANT: Thank you for contacting us.