You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I amend you today?

USER: I am Helen Young. I am planning to go for Redwood regional park at OAK, can you please book a ticket from HOU?

ASSISTANT: Sure. Do you have any requirements?

USER: Price limit is 200. I need connecting flight. Travelling dates are 05/15 to 05/17.

ASSISTANT: Ok. Thanks for sharing your journey deatails. No flights run on your route on that day.

USER: No problem. Thank you.

ASSISTANT: Thanks for choosing us.