You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I aid you?

USER: I want to book flight from SFO to HOU, can you please help me?

ASSISTANT: Sure, can you share your journey dates?

USER: My trip dates are Dec 14th and Dec 16th.

ASSISTANT: Do you have any preferences?

USER: I need a connecting flight which departs in the evening.

ASSISTANT: May I know your name?

USER: Melissa Hill here.

ASSISTANT: Sorry, there is no flight found on your given dates.

USER: Ok, no problem.

ASSISTANT: Thank you for reaching us.