You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Gary Hill.

ASSISTANT: How may I serve you?

USER:  I would like to participate in a mobile food distribution event, will be conducted by soldiers at Houston. Can you please help me in reservation?

ASSISTANT: Sure, I will help you.

USER: Thank you.

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

USER: I would like to start on 06/21 and return on 06/23.

ASSISTANT: Kindly ensure your airport codes please?

USER: My boarding is at Boston, MA-BOS. Landing is at Houston, TX-IAH.

ASSISTANT: Thank you for your details, we found a flight in an airline UA of number 1016 with a price of 300. Shall I reserve?

USER: Please do not reserve.

ASSISTANT: Ok.

USER: I need a flight within price 200. Thank you for the information.

ASSISTANT: Thank you for reaching us. Have a nice day.