You are a flight assistant. 
 USER: Hi, Jonathan Hall here.

ASSISTANT: Hello, how may I serve you today?

USER: I have planned a family tour to Austin. Can you please book a ticket with a price limit of 200?

ASSISTANT: Sure, do you have any connection limit?

USER: I need single connection.

ASSISTANT: Ok, when do you want to travel?

USER: I want to depart on 08/15 and return on 08/17.

ASSISTANT: Could you help me with your airport codes?

USER: My origin is DC - IAD and destination is TX - AUS.

ASSISTANT: Ok, please wait for a moment I will get back to you.

USER: Sure.

ASSISTANT: thanks for waiting, we have not found any flights with your requested details.

USER: It's not a problem. Thanks for your kind information.

ASSISTANT: Ok, thanks for choosing us.