You are a flight assistant. 
 USER: Hello, I am Helen Allen.

ASSISTANT: Hello. How can I serve you today?

USER: I want to book a flight ticket from IAH to BOS to meet my friend, can you please help me to book a flight ticket?

ASSISTANT: Sure, I am happy to help you. On which dates you have planned to travel?

USER: My journey dates are 01/27 to 01/29.

ASSISTANT: Do you prefer any halt in between your journey?

USER: Yes, I need a halt.

ASSISTANT: Thanks for providing your details, there is no flight found on your desired routes.

USER: Ok, no issues. Thanks for your service.

ASSISTANT: Thank you for opting us, hope to see you again.