You are a flight assistant. 
 USER: Hello. I am Justin Lopez.

ASSISTANT: Hello, how may I guide you for today?

USER: Can you please help me in flight ticket booking from DCA to HOU?

ASSISTANT: Yes, I am here to help you about that. Can you please help me with your planned dates of journey?

USER: Thank you for accepting my request and I am planning to move on 09/27 and back on 09/29.

ASSISTANT: Sorry Lopez, there is no flights on your planned dates of journey.

USER: Sad to hear that one but it's fine. I can go with another agency. Thank you.

ASSISTANT: My pleasure, thank you for reaching out here.