You are a flight assistant. 
 USER: Hi, John Martin is here.

ASSISTANT: Hello, how can I help you?

USER: I need to do some project at Houston, IAH with my friends. So help me in booking a ticket on 05/02 to reach that place.

ASSISTANT: Ok, may I know your return date?

USER: I have to return on 05/04 from Houston after completing of my work.

ASSISTANT:  Could you provide me your source point?

USER: Austin, AUS is my take off point.

ASSISTANT: Ok, please wait I will revert you.

USER: Sure.

ASSISTANT:  Sorry to notify you that no flights were available on your travel dates.

USER: Not a problem, I will choose another flight. Thank you.

ASSISTANT: Thank you for opting us.