You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, what can I do for you today?

USER: Can you help me in booking from IAH to AUS?

ASSISTANT: Sure, I am glad to help you. When are you planning to start and return?

USER: My trip dates are May 4 to May 6.

ASSISTANT: In which class, you prefer to go?

USER: I am comfortable with any class.

ASSISTANT: Can I have your name please?

USER: I am John Evans.

ASSISTANT: Do you have any other essentials to meet?

USER: No.

ASSISTANT: Ok, please wait for sometime.

USER: Sure.

ASSISTANT: Sorry to inform you that, no flight are found based on your given schedule.

USER: No issue, thank you.

ASSISTANT: Thank you for consulting us.