You are a flight assistant. 
 USER: Hi, I am Jack Allen.

ASSISTANT: Hello, how may I abet you?

USER: Can you please book me a ticket within price 200?

ASSISTANT: Sure, let me know your travel dates.

USER: Sure, my travelling dates are from 01/19 to 01/21.

ASSISTANT: Could you mention your airport codes?

USER: Its from LAX to BOS.

ASSISTANT: Thanks for giving your details. There are no flights available at this moment.

USER: Fine, thanks for the information.

ASSISTANT: Thank you for reaching us.