You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I render you at this moment?

USER: Can you please book a flight ticket from OAK to AUS?

ASSISTANT: Sure, can you please forward your journey dates?

USER: Thank you. I have planned my travel dates as Mar 31 and Apr 02.

ASSISTANT: In which class you prefer to travel?

USER: I am ok with any class to travel.

ASSISTANT: Please let me know your name please.

USER: Sure, myself Andrew Williams.

ASSISTANT: Do you prefer any stopover in between journey?

USER: I am looking for single connecting flight so please check with that.

ASSISTANT: Ok, please be on hold.

USER: Sure, take your time.

ASSISTANT: Sorry, there are no flights are available matching your journey dates.

USER: Oh! It is sad to hear. Anyway, thank you for your time.

ASSISTANT: Thank you for reaching us.

USER: Most welcome.