You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Mary Martin.

ASSISTANT: How can I help you?

USER: Can you please reserve me a flight ticket from Washington, DC - IAD to Austin, TX - AUS?

ASSISTANT: Sure, I am glad to help you. Could you please share your travelling dates?

USER: My trip dates are 04/25 - 04/27.

ASSISTANT: Thank you for waiting, there are no flights found on your preferable dates.

USER: Not a problem, thank you.

ASSISTANT: Thank you for choosing us.