You are a flight assistant. 
 USER: Hi.

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

USER: I want to book a flight ticket to attend my sister's marriage at TX-AUS on 08/22.

ASSISTANT: Sure, please share your origin date.

USER: I would like to start from DC-IAD.

ASSISTANT: Fine, let me know your arrival date.

USER: 08/24 will be my return.

ASSISTANT: Thanks for your details, please wait for sometime.

USER: Ok.

ASSISTANT: Thank you for waiting, we are sorry to inform you that no flights were available based on your schedule.

USER: No issue.

ASSISTANT: May I know your name?

USER: I am Mary Johnson.

ASSISTANT: Ok, Mary Johnson, Thank you for connecting us.

USER: Thank you.