You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you?

USER: I am Betty Davis. Can you please help me in booking my flight ticket from IAD to HOU?

ASSISTANT: Sure, help me with the trip dates?

USER: My trip dates are Dec 31 and Jan 02.

ASSISTANT: Do you have any other preferences?

USER: I want my depart and arrival flights at evening time only. I need connecting flight.

ASSISTANT: Sorry, no flights were available at this moment.

USER: Ok, fine thank you for checking.

ASSISTANT: Thank you for reaching us.