You are a flight assistant. 
 USER: Hi. I am Frank Davis.

ASSISTANT: Hello, How can I help you?

USER: I am planning to visit NASA Space Center at IAH, can you please book me a ticket from LAX?

ASSISTANT: Sure, May I know the trip dates?

USER: My trip dates are from May 2nd to May 4th.

ASSISTANT: Please wait a moment.

USER: Ok.

ASSISTANT: Sorry, No flights found with your chosen dates.

USER: No issues, thank you for your information.

ASSISTANT: Thank you for availing us.