You are a flight assistant. 
 USER: Hi. I am Deborah Robinson.

ASSISTANT: Hello, How can I help you?

USER:  I want to book a flight ticket on 05/18 and return on 05/20, so can you help me with booking please?

ASSISTANT: Sure, Please help me with your travel dates.

USER: I have mentioned above.

ASSISTANT: Sorry, Please help me with your journey codes.

USER: My airport codes are Austin, TX-AUS and Washington, DC-DCA.

ASSISTANT: Please wait a minute.

USER: Ok.

ASSISTANT: Sorry, No flights found with your chosen dates.

USER: That's ok. Thank you for the response.

ASSISTANT: Thank you for reaching us.