You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Rachel Martinez here.

ASSISTANT: Rachel, how may I help you?

USER: I need to book a flight ticket from IAH  to OAK. Can you please help me out in booking a flight ticket?

ASSISTANT: Sure, please share your trip dates.

USER: My trip dates are 09/09 and 09/11.

ASSISTANT: Sorry, no flight is available on your route.

USER: Not a problem, anyway thank you for the information.

ASSISTANT: Thank you for choosing us.