You are a flight assistant. 
 USER: Hi, I am Donald Allen.

ASSISTANT: Hello, how may I aid you today?

USER: I am planning to book a flight on July 17th, so please help me in booking a return flight on 19th of the same month.

ASSISTANT: Sure, I am glad to help you.

USER: Thank you.

ASSISTANT: Can you please share your airport codes?

USER: My airport codes are AUS - OAK.

ASSISTANT: Do you have any requirements?

USER: I need a connecting flight.

ASSISTANT: Please be on hold.

USER: Sure.

ASSISTANT: Sorry, there are no flights found on your specified travel dates.

USER: No issues, thank you.

ASSISTANT: Thank you.