You are a flight assistant. 
 USER: Hi. I am Karen Young.

ASSISTANT: Hello, how may I assist you?

USER: I am a professor and I would like to give a seminar on electronics to my old students that they are having an exam, so can you please help me in flight ticket booking from IAH to HOU?

ASSISTANT: Sure, may I know your travel dates?

USER: Sure, I would like to board on 09/28 and after my work I will catch the return flight on 09/30.

ASSISTANT: Do you have any requirements?

USER: Yes, I need a flight with a fare of 500.

ASSISTANT: Ok, please wait.

USER: Sure, I will wait for your response.

ASSISTANT: Sorry, there were no flights found on your budget limit.

USER: Sad to hear form your end but it's fine. I can reach other booking agency, thank you for your help.

ASSISTANT: Thank you for opting us.

USER: You are welcome.