You are a flight assistant. 
 USER: Hello, I am Brian Nelson.

ASSISTANT: Hello, how can I help you today?

USER: I am planning to visit my friend's house in Austin, can you please help me to book a flight from IAH-AUS?

ASSISTANT: Sure, please help me with your travelling dates?

USER: My journey dates are from 03/15 to 03/17.

ASSISTANT: Ok, please wait for a while.

USER: Ok.

ASSISTANT: Thanks for waiting, no flights found with your given details.

USER: Ok, no issues.

ASSISTANT: Thank you for choosing us.

USER: Thanks for your service.