You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. What type of help your going to seeking from our service for today?

USER: I want to visit Boston on 05/10 to 05/12.Can you please help me for booking the flight ticket?

ASSISTANT: Ok, could you provide your destination place to travel?

USER: The destination code is TX-AUS.

ASSISTANT: Could you provide your name and source of your journey?

USER: The source code is from TX-IAH. My name is Daniel Davis.

ASSISTANT: Sorry for the inconvenience, there is no flight which travels AUS from our service.

USER: Ok, no issue.I will search another flight. Thank you for your service.

ASSISTANT: Thank you for choosing us.