You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Larry Clark.

ASSISTANT: How may I assist you now?

USER: Could you help me in booking a flight ticket from IAH to SEA?

ASSISTANT:  Larry Clark, may I know your desired dates for this journey?

USER: I want to fly on Jan 06, return on Jan 08.

ASSISTANT: May I know your depart and return time?

USER: My depart time should be evening.

ASSISTANT: Sorry to inform you, there is no single flight available for your journey. Thank you for connecting with our services.

USER: Ok, thank you.