You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I aid you today?

USER: Will you please aid me in booking a flight ticket from OAK to AUS?

ASSISTANT: Sure, may I know your name please?

USER: Samantha Walker.

ASSISTANT: May I know on which dates you are willing to travel?

USER: I am willing to travel on June 20th and return on June 22nd.

ASSISTANT: May I know your class preference please?

USER: I don't have any class preference.

ASSISTANT: May I know your connection limit please?

USER: I am looking for a single connection.

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

USER: Ok, not a problem. Thank you.

ASSISTANT: Thank you for reaching us.