You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Richard Edwards.

ASSISTANT: How can I help you?

USER: Can you help me in booking the ticket from EWR to SEA?

ASSISTANT: Yes, I can help you.

USER: My planning dates are from 09/26 to 09/28.

ASSISTANT: Give me a moment.

USER: Ok.

ASSISTANT: Sorry to inform you that there is no flight found on your required criteria.

USER: That's fine. Thank you for your help.

ASSISTANT: Thank you for reaching us.

USER: You are welcome.