You are a flight assistant. 
 USER: Hello, myself Donna Martinez.

ASSISTANT: Hello, how may I render you?

USER: I got an admission in University of Texas, So I need to attend for a certificate verification process. Can you hold me a flight ticket from Washington, DC - DCA?

ASSISTANT:  Sure, we are mirthful to help you.

USER: Thank you.

ASSISTANT: When are you planning to make your journey?

USER: My travelling dates are 06/30 - 07/02.

ASSISTANT: Help me with the destination code?

USER: My landing airport code is TX - AUS.

ASSISTANT: Do you have any preferences?

USER: Yes, I need a direct flight.

ASSISTANT: Please be on hold.

USER: Sure.

ASSISTANT: Thank you for waiting, sorry to inform you that unfortunately there is no flights available by the given details.

USER: Ok, not a problem. Thanks for your information.

ASSISTANT: Thanks for choosing us. Have a nice day.