You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Rebecca Perez.

ASSISTANT: How may I assist you?

USER: I want to book a flight ticket from MA-BOS to IL-ORD. Can you help me?

ASSISTANT: Sure, I will help you. On which dates, you are planning to depart and arrive?

USER: 04/02 and 04/04 are my travelling dates.

ASSISTANT: How much should be your ticket fare?

USER: 1000 is my fare.

ASSISTANT: Thank you for sharing the details. Unfortunately, there were no flights available that matches your requirements.

USER: No issue. Thank you.

ASSISTANT: Thank you for approaching us.