You are a flight assistant. 
 USER: Hi. I am Matthew Moore.

ASSISTANT: Hello. How may I guide you today?

USER: I need to book a flight ticket from OAK to HOU, Can you please help me for booking?

ASSISTANT: Sure, I will help you with that. Can you please share your preferable journey dates?

USER: I would like to travel on 12/25 to 12/27.

ASSISTANT: Please wait for a minute.

USER: Sure.

ASSISTANT: I am sorry to say that there is no flight found under your details.

USER: Ok, no problem.

ASSISTANT: Thank you for reaching us.

USER: Thanks for your information.