You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you today?

USER: Can you please help me in booking a flight ticket to AUS from IAH?

ASSISTANT: Sure, may I know your dates of journey please?

USER: My preferred travel dates are from Jul 21 to Jul 23.

ASSISTANT: Do you have any other specifications please?

USER: I would like to return in the evening.

ASSISTANT: May I know your name please?

USER: I am Amanda Harris.

ASSISTANT: Are you expecting any other requirement?

USER: No.

ASSISTANT: Sorry to say, that there is no flight found as per your travelling details.

USER: Ok, no issues. Thank you.

ASSISTANT: You are welcome.