You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Thomas Turner.

ASSISTANT: How may I help you?

USER: I am planning to visit Houston, can you please book me a ticket from IAD to IAH?

ASSISTANT: Sure, can you share your travel dates please?

USER: My preferable journey dates are Aug 27 and Aug 29.

ASSISTANT: May I know your departure and return time please?

USER: I prefer to depart in the evening flight and would like to return in afternoon flight.

ASSISTANT: Do you have any other preferences?

USER: I prefer connecting flight.

ASSISTANT: Sorry there no flights available in the evening time.

USER: Ok, not an issue. Thank you for providing information.

ASSISTANT: Not a problem. Thank you.