You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you?

USER: I would like to book a flight ticket from EWR to HOU, can you help me with that?

ASSISTANT: Sure, may I know your travelling dates please?

USER: My travel dates are 07/16 and 07/18.

ASSISTANT: Do you have any airline preference?

USER: I want to travel in normal cost airlines.

ASSISTANT: Can I know your good name please?

USER: I am Katherine Robinson.

ASSISTANT: We are sorry to inform you that there is no flight found with your matching details.

USER: That's ok. Thank you.

ASSISTANT: Thank you for opting us.