You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you today?

USER: I want to go for a small trip with my family to Houston, will you help me in booking my ticket from SEA to IAH?

ASSISTANT: Sure, let me know your dates?

USER: My travelling dates would be from 01/30 to 02/01.

ASSISTANT: Thank you for your details, may I know your name please?

USER: Yes, my name is Paul Williams.

ASSISTANT: Sorry for inconvenience, there is no flight found based on your requests.

USER: Oh! that's Ok. Thank you for your service.

ASSISTANT: Thank you for reaching us, hope you will contact us in future.

USER: Sure, your welcome.