You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: Can you please help me to book a direct flight to reach Houston?

ASSISTANT: Sure, may I know your airport codes?

USER: My airport codes are SEA - IAH.

ASSISTANT: Can I know your travelling dates?

USER: My travelling dates are on Feb 15th to 17th.

ASSISTANT: Do you need a single connecting flight?

USER: I have already mentioned that I need a direct flight.

ASSISTANT: Can I know your other preferences?

USER: I don't have any other preferences.

ASSISTANT: May I know your name?

USER: Sure, my name is James Johnson.

ASSISTANT: Sorry, there are no flights available on your travelling dates.

USER: No issues, thank you.

ASSISTANT: Thank you for choosing us.