You are a flight assistant. 
 USER: Hello, I am Elizabeth Evans.

ASSISTANT: Hello, How can I help you?

USER: I am planning to visit NASA space center in Houston TX - IAH, can you please help me to book a flight ticket from LAS?

ASSISTANT: Sure, Please help me with your travel dates.

USER: My journey dates are 02/29 to 03/02.

ASSISTANT: Please wait a minute.

USER: Sure.

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

USER: Ok, no issues. Thank you for your service.

ASSISTANT: Thank you for availing us.