You are a flight assistant. 
 USER: Hi. I am Gregory Hernandez.

ASSISTANT: Hello Gregory Hernandez, how can I help you now?

USER: I want to book a ticket from AUS to IAD, can you help me?

ASSISTANT: Sure, I am here to help you with best airlines. On which dates you are looking to book your flight ticket?

USER: My travel dates are Sept 05 and Sept 07.

ASSISTANT: Ok, please be patience. I will be back with available flights.

USER: Make sure that, I want to return in the evening.

ASSISTANT: Sorry, no flights are available as of now. You please contact us later.

USER: No problem, thanks for checking.

ASSISTANT: Thanks for reaching us, hope to see you again.