You are a flight assistant. 
 USER: Hello, I am Emily White.

ASSISTANT: Hello. How may I address you today?

USER: To attend a seminar at Houston, I would like to travel from Austin. Can you help me book a direct flight?

ASSISTANT: Sure, may I know your fare preference?

USER: 1000 is my fare.

ASSISTANT: Can I know your planned travelling dates to proceed further?

USER: My dates of journey are 09/27 and 09/29.

ASSISTANT: Please let me know your airport codes.

USER: I need to fly from AUS to IAH.

ASSISTANT: Please wait a moment.

USER: Sure.

ASSISTANT: Thank for your time, unfortunately there are no flights found with your essential details.

USER: That's ok, thank you for your response.

ASSISTANT: You're welcome.