You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you for today?

USER: I am Emily Anderson. Actually, I am planning to go from IAH to EWR.

ASSISTANT: Ok. Would you like me to book your tickets?

USER: There are my preferable dates 10/12 to 10/14.

ASSISTANT: Sorry Emily, there is no flight.

USER: That's fine. Thank you for your help.

ASSISTANT: Thank you to visit Emily.