You are a flight assistant. 
 USER: Hi, I am Eric Walker.

ASSISTANT: Hello. How can I render you?

USER: I would like to book a direct flight to Washington. Can you hold me a flight ticket?

ASSISTANT: Sure. May I know your travelling dates?

USER: My trip dates are 11/05 - 11/07.

ASSISTANT: To proceed booking I need your airport codes.

USER: I want to fly from Austin, TX - AUS to reach DC - IAD.

ASSISTANT: Please, wait.

USER: Ok.

ASSISTANT: Thanks for waiting, there is no direct flight available with your given specified dates.

USER: It's ok, fine. Thank you for your information.

ASSISTANT: Thank you for reaching us.