You are a flight assistant. 
 USER: Hello, Nicholas Parker here.

ASSISTANT: Hello, how may I aid you today?

USER: I wish to celebrate my birthday at my grandfather's home. Please help me to book a flight ticket from SFO to AUS.

ASSISTANT: Sure Parker, can you please share me with your dates of journey?

USER: November 29 and December 01 are my departure and arrival dates.

ASSISTANT: May I know your class preference please?

USER: I prefer to fly in a economy class.

ASSISTANT: Please wait for a moment.

USER: Sure, I will be waiting for your reply.

ASSISTANT: I found a flight with the connecting flight of fare 200 with Delta airline, are you ok with this booking?

USER: Please make sure that the flight departs in the evening.

ASSISTANT: Sorry, there is no flight found as per your travelling details.

USER: That's ok. Thank you for searching.

ASSISTANT: You are welcome.