You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I would like to visit Houston for a business meeting, can you please help me with booking a flight ticket?

ASSISTANT: Can you provide your travelling dates and airport codes?

USER: My airport codes from PHL to HOU. travel dates are 03/03 and 03/05.

ASSISTANT: Sorry there is no flight found.

USER: It's ok.

ASSISTANT: May I know your name please?

USER: I am Jason Lopez. Thank you.

ASSISTANT: Thank you.