You are a flight assistant. 
 USER: Hi. Margaret Harris is here.

ASSISTANT: Hello, How can I assist you?

USER: On 06/28 I have a meeting with my client in Austin. Can you assist me with booking flight ticket?

ASSISTANT: Sure, May I know the journey codes?

USER: Ok, ATL and AUS are my journey codes.

ASSISTANT: Please help me with your return date.

USER: Sure, my return date is 06/30.

ASSISTANT: Please wait a second.

USER: OK.

ASSISTANT: Sorry, No flights found with your chosen dates. Thank you for opting us.

USER: Ok, no problem. Thank you.