You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you?

USER: Can you help me to book flight ticket to reach IAH from SEA?

ASSISTANT: Sure, May I know your travelling dates?

USER: My planned dates are Dec 25 and Dec 27.

ASSISTANT: Ok, Do you have any airline preference?

USER: Yes, I prefer to travel in normal cost airlines.

ASSISTANT: Ok, please provide your class preference.

USER: I am comfortable with any class.

ASSISTANT: Ok, Do you prefer direct flight or connected flight?

USER: I prefer single connecting flight.

ASSISTANT: Ok, Do you have any other preferences related to booking?

USER: No, thanks for asking.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

ASSISTANT: Thank you for waiting, there were no flights found with your given details.

USER: Ok, not a problem.

ASSISTANT: Ok, May I know your name?

USER: Sure, myself  Angela Lewis.

ASSISTANT: Ok, Thank you for approaching us.

USER: Thank you for your information.

ASSISTANT: Have a nice day.