You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: Can you help me in booking flight ticket from IAD to HOU?

ASSISTANT: Sure, May I know your travelling dates?

USER: My trip dates are Feb 21 to Feb 23.

ASSISTANT: Ok, please let me know your connection limit.

USER: I need a connecting flight.

ASSISTANT: Ok, Do you have any other preferences?

USER: My depart and return should be in the afternoon.

ASSISTANT: Ok, please wait.

USER: Sure.

ASSISTANT: Thank you for your time, we did not find any flights with your given details.

USER: Ok, no problem.

ASSISTANT: Ok, May I know your name?

USER: Myself Robert Moore. Thank you.

ASSISTANT: Ok, Thank you.