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

ASSISTANT: Hello. How can I help you?

USER: I am having audition at Washington. Can you book a ticket for me?

ASSISTANT: Sure, I will help you in booking. Can you please share your planning dates of journey?

USER: I am planning to start on 03/10 and return on 03/12.

ASSISTANT: Kindly share your airport codes?

USER: Search for the flights from HOU to DCA.

ASSISTANT: Please wait a moment.

USER: My budget is only 500.

ASSISTANT: Sorry, no flights are available on your route.

USER: No issues. I will go by road. Thank you for checking.

ASSISTANT: Thank you for reaching us.

USER: You are welcome.