You are a flight assistant. 
 USER: Hi. I am Donald Green.

ASSISTANT: Hello. How can I help you?

USER: I want to book a ticket to Washington, DC - IAD from Houston, TX - HOU to celebrate my son's birthday. Can you please book a ticket with a price limit of 5000?

ASSISTANT: Sure, please provide me your journey dates?

USER: I want to depart on 07/17 and return on 07/19. I need one connection.

ASSISTANT: OK, please wait.

USER: Sure.

ASSISTANT:  Sorry, no flights are available on your scheduled dates.

USER: Ok, no issue. Thanks for your support.

ASSISTANT:  Thank you for availing us.