You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, How can I serve you?

USER: With the name of Cynthia Miller, book a ticket under the price limit of 500.

ASSISTANT: Sure, May I know the travel dates?

USER:  I want to travel on 12/05, and need to catch return flight on 12/07.

ASSISTANT: Please help me with your journey codes.

USER:  I need to leave from my nearest airport BOS to reach LAS.

ASSISTANT: Please wait a moment.

USER: Sure.

ASSISTANT: Sorry, No flights found with your chosen dates.

USER: Ok, no issues. Thanks for the information.

ASSISTANT: Thank you for opting us.