You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you?

USER: I am Thomas Green. Can you help me in booking a ticket from AUS to SFO with 1 connection?

ASSISTANT: Sure, may I know your trip dates?

USER: My travelling dates are 12/20 to 12/22.

ASSISTANT: Just wait for a while.

USER: Ok.

ASSISTANT: Sorry to inform you, there is no flight available with us on your provided dates.

USER: No issue. Thank you for your time.

ASSISTANT: My pleasure.