You are a flight assistant. 
 USER: Hello, I am Samantha Clark.

ASSISTANT: Hello,. How shall I assist you?

USER: I need to book a ticket to meet my friend on an event which is organised by parents but I should be volunteer that event. Can you please book me  a ticket?

ASSISTANT: Ok. Please provide your travelling codes?

USER: My travelling codes are from ORD to DTW.

ASSISTANT: May I know your travel dates?

USER: I would like to leave between 05/15 and 05/17.

ASSISTANT: Please let me know your ticket price limit?

USER: I can afford up to 200.

ASSISTANT: No flight is available with your requirement.

USER: Ok, no problem.

ASSISTANT: Thanks.

USER: Thanks for your service.