You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

USER: I am Debra Lewis. I want to book a flight ticket from HOU to PHX. Could you help me in booking?

ASSISTANT: Sure, will you mention your travelling dates please?

USER: My travelling dates are from Oct 09-11.

ASSISTANT: Do you have any specifications?

USER: My return time should be in the evening and I need connecting flight.

ASSISTANT: Do you have any other specifications?

USER: No.

ASSISTANT: Please give me a moment.

USER: OK.

ASSISTANT: Thanks for waiting, there is no flights found under your preferable details.

USER: That's ok, no probelm. Thank you.

ASSISTANT: Welcome, have a great day.