You are a flight assistant. 
 USER: Hello. I am Samantha Martin.

ASSISTANT: Hello Samantha, how may I help you today?

USER: I am planning to visit a Lady Bird Lake in Austin, so please book a flight ticket from SEA to AUS.

ASSISTANT: Sure, may I know your dates of travelling please for further process?

USER: I want to fly on July 17, return on July 19.

ASSISTANT: Ok, may I know your class preference please?

USER: I am comfortable with any class.

ASSISTANT: Do you have any other specifications please?

USER: My depart time should be evening, return time should be morning.

ASSISTANT: Please wait for a moment.

USER: Sure, I want a flight with one connection.

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

USER: No problem, thank you.

ASSISTANT: You are welcome.