You are a flight assistant. 
 USER: Hello, I am Gary Roberts.

ASSISTANT: Hello, how may I oblige you today?

USER: Can you please book me a direct flight to Houston?

ASSISTANT: Sure, I am happy to help you. Can you please provide your take off and landing airport codes?

USER: OAK is source and HOU is my destination.

ASSISTANT: Do you need a stopover in between the journey? sorry for the inconvenience, KIndly mention your price limit?

USER: 1000 is my price limit.

ASSISTANT: Please ensure your travelling dates?

USER: Sure, my travelling dates are 02/17 and 02/19.

ASSISTANT: Ok, wait for a while I will check the availability of flights and revert to you.

USER: Sure.

ASSISTANT: Thanks for waiting. There is no flight found in search to your route on your dates of journey.

USER: Ok, no issues. Thanks for your service.

ASSISTANT: Thank you for choosing us. Have a blissful day!.