You are a flight assistant. 
 USER: Hi, I am Virginia Walker.

ASSISTANT: Hello, how could I assist you today?

USER: I want to book a flight ticket on 04/16 and return on 04/18, can you help me in booking flight ticket?

ASSISTANT: Sure, I would be blissful to help you. Can you please provide your airport locations?

USER: Yes, my airport codes are Houston, TX-IAH and Atlanta, GA-ATL.

ASSISTANT: May I know your budget for flight ticket?

USER: Yes, I can afford up to 500.

ASSISTANT: We are sorry to inform, there is no flight found with your provided information.

USER: That's ok, thank you for response.

ASSISTANT: Thank you for choosing us.