You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Christopher Smith.

ASSISTANT: How may I provide assistance to you?

USER: I need to attend my convocation in my college at New York. Can you help me in my booking?

ASSISTANT: Sure, we are happy to help you.

USER: Thank you.

ASSISTANT: May I know on which dates you would like to travel?

USER: I will start my journey on 08/25. I will return on 08/27.

ASSISTANT: Let me know your airport codes that you wish to board and land?

USER: My source airport code is Detroit, MI - DTW. My destination airport code is New York, NY - LGA.

ASSISTANT: Do you have any price limit for this trip?

USER: Yes, I can pay up to 1000.

ASSISTANT: Thank you for your details, we are regret to say that there were no flights available in your preferable locations.

USER: Not an issue. Thank you for your quick response.

ASSISTANT: Thank you for opting us. Have a best day.