You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Alexander Lopez.

ASSISTANT: How can I assist you?

USER: Can you please help me in booking my flight ticket from PHL to IAH?

ASSISTANT: May I Know your travelling dates?

USER: My travelling dates are 01/12 and 01/14.

ASSISTANT: Sorry to say, no flight is available for you on your requests.

USER: Ok, fine thank you for checking.

ASSISTANT: Thank you for reaching us, have a nice day.