You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I help you?

USER: I am Nicole Martin. Can you please help me in booking my flight ticket from IAH to PHL?

ASSISTANT: Your travelling dates please?

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

ASSISTANT: I am sorry no flights found on your route.

USER: Ok, fine thank you for checking.

ASSISTANT: Thank you for choosing us.